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Delta Reign Prerelease UK: Build & Battle Box, Promos and How It Works

Collector's Edge

Masquerain, Magmortar, Enamorus and Kommo-o promo cards from the Pokémon TCG Delta Reign Build & Battle Box

Delta Reign prereleases start on 24 October 2026 at select Play! Pokémon stores, just under two weeks before the set comes out on 6 November. You buy a Build & Battle Box, open four Delta Reign packs, mix the best cards into a ready-made 40-card deck and play quick games with four Prize cards. Here's how it works, what's in the box, and how to get the most out of each of the four promo decks.

PrereleasesFrom 24 Oct 2026
Set release6 Nov 2026
Deck size40 cards
Prize cards4
In the box4 packs, a deck, 1 promo
PromosMasquerain, Magmortar, Enamorus, Kommo-o

Looking for the cards in the set itself, the Mega ex and the new Legendary Stadiums? That's all in our Delta Reign set preview. This page is about the prerelease.

01 · Dates

When and where are Delta Reign prereleases in the UK?

24 Oct 2026Prereleases beginSelect Play! Pokémon stores start selling the Build & Battle Box
1 Nov 2026Prerelease window closesReported by PokeBeach; stores set their own event days within it
6 Nov 2026Delta Reign releasesBuild & Battle Boxes go on general sale

Prereleases are run by local shops that are Play! Pokémon stores, not by The Pokémon Company directly, so each store picks its own days and times inside the window. The easiest way to find one is to ask your nearest games shop whether it's a Play! Pokémon store and whether it's running Delta Reign events. If the store takes bookings, book early.

02 · The format

How the Pokémon prerelease format works

40cards in your deck, not 60
4Prize cards, not 6
4Delta Reign packs to open
Standard Prerelease
Deck size 60 cards 40 cards
Prize cards 6 4
Cards you build from Your whole collection (Standard legal) Your Build & Battle Box

Pokémon describes the format as quick, fun battles, and it's the friendliest event in the game. Because everyone is building from the same small pool, a new player with one box is on a level footing with someone who plays every week. Games are shorter than Standard because there are only four Prizes to take.

Check with your storeEach store runs its own event, so check how many rounds there are and how pairings work before you start. Some run it as a casual open play, others as a small tournament.

03 · The box

What's in the Delta Reign Build & Battle Box?

Pokémon TCG Delta Reign Build & Battle Box with booster packs and its four promo cards
The Delta Reign Build & Battle Box and its four possible promos. Image: The Pokémon Company International
  • 4 Mega Evolution: Delta Reign booster packs
  • A 40-card ready-to-play deck with key cards from current and earlier expansions
  • 1 of 4 foil promo cards: Masquerain, Magmortar, Enamorus or Kommo-o

The promo decides which deck you're playing. Pokémon's own preview pairs each promo with a strategy, which means two people opening boxes at the same table can end up with very different decks. The promos are numbered MEP 111 to 114, and PokeBeach reports they're alternate-art versions of cards in the set.

04 · The decks

The four Delta Reign prerelease promo decks

Masquerain promo card MEP 111 from the Delta Reign Build & Battle Box
MasquerainMEP 111Promo
Magmortar promo card MEP 112 from the Delta Reign Build & Battle Box
MagmortarMEP 112Promo
Enamorus promo card MEP 113 from the Delta Reign Build & Battle Box
EnamorusMEP 113Promo
Kommo-o promo card MEP 114 from the Delta Reign Build & Battle Box
Kommo-oMEP 114Promo

Images: The Pokémon Company International

Masquerain: Bug Out

Masquerain's Bug Out does 50 damage for each Pokémon with the Bug Out attack among the bottom 7 cards of your deck, and it costs just one Grass Energy. Spinarak and Sizzlipede both have Bug Out too, but at three Colorless, so they're there to fill your deck rather than attack. Sacred Ash shuffles up to five Pokémon from your discard pile back into your deck, putting your bugs back where Bug Out can find them.

Spinarak, Pokémon TCG Delta Reign 058/103
Spinarak058/103
Sizzlipede, Pokémon TCG Pitch Black 009/084
Sizzlipede009/084 (Pitch Black)
Sacred Ash Item card, Pokémon TCG Destined Rivals 168/182
Sacred Ash168/182 (Destined Rivals)

Images: The Pokémon Company International

Watch your deckBug Out reveals your bottom 7 cards and then discards everything that isn't a Pokémon. Every attack thins your deck, so keep a Sacred Ash for later and don't let it run low in a long game.

Magmortar: Buddy Boost

Once a turn, Magmortar's Buddy Boost attaches a Basic Fire Energy, a Basic Lightning Energy, or one of each from your hand to Electivire and Magmortar in any way you like. Pile them on Electivire: Voltaic Hammer discards any amount of Basic Energy from it and does 60 damage for each card discarded. Adventure Lantern searches out one Basic Fire and one Basic Lightning Energy to keep it going.

Electivire, Pokémon TCG Delta Reign 031/103
Electivire031/103
Adventure Lantern Item card, Pokémon TCG Delta Reign 090/103
Adventure Lantern090/103

Images: The Pokémon Company International

The mathsFour Energy on Electivire is a 240-damage Voltaic Hammer. You don't have to discard everything: throw away only what you need for the knockout and keep the rest for next turn.

Enamorus: the Forces of Nature

Enamorus, Thundurus, Landorus and Tornadus share the Incarnate Solidarity Ability: with all four in play, they ignore every Colorless Energy in their attack costs. That turns Landorus's Gaia Crush into 110 damage for one Fighting Energy, and Tornadus's Corkscrew Dive (70 damage, then draw until you have six cards) into a free attack. Enamorus's Rising Heart adds 100 damage against a Pokémon ex.

Thundurus, Pokémon TCG Delta Reign 035/103
Thundurus035/103
Landorus, Pokémon TCG Delta Reign 054/103
Landorus054/103
Tornadus, Pokémon TCG Delta Reign 085/103
Tornadus085/103

Images: The Pokémon Company International

All four or nothingIncarnate Solidarity only works with all four in play at once. In a 40-card deck you may not draw every one in time, so plan turns where you can still attack without the discount.

Kommo-o: Beat Scales

Kommo-o plays on its own. Beat Scales looks at the top 6 cards of your deck once a turn and attaches any Basic Energy there to your Dragon Pokémon. Kommo-o's Hammer In does 170, so power it up first. Druddigon is the back-up: Beat Scales can attach any type of Basic Energy, which covers Claw Slash's three Colorless cost for 80 damage.

Kommo-o promo card MEP 114 from the Delta Reign Build & Battle Box
Kommo-oMEP 114Promo
Druddigon, Pokémon TCG Delta Reign 072/103
Druddigon072/103

Images: The Pokémon Company International

05 · Deck building

How to build a good prerelease deck

1Play the deck first, then tweak itYour 40-card deck already works. Open your packs, then swap cards in one for one so you stay at 40.
2Lean into your promoThe deck is built around it. New cards that help the promo's plan beat a random strong card.
3Keep your Energy matchedIf you add a Pokémon of a new type, add the Energy to attack with it, or leave it out.
4Count your BasicsToo few Basic Pokémon and you risk a bad opening hand. Swap out an Evolution before you swap a Basic.
5Check the StadiumsDelta Reign's Legendary Stadiums need both halves in your hand. Only add one if you opened both. How Legendary Stadiums work.
Do
  • ✓Add cards that draw or search: they matter more in a 40-card deck
  • ✓Add a Mega ex if you pulled one and have the Energy for it
  • ✓Play test a couple of hands before your first round
Don't
  • ✕Don't mix in a second plan that needs different Energy
  • ✕Don't go over 40 cards: the format is fixed
  • ✕Don't add a single Stadium half: it can't be played alone

06 · Kit list

What to bring to a Pokémon prerelease

  • Card sleeves for 40 cards, so new pulls don't get scuffed: card sleeves
  • A deck box to carry your deck home: deck boxes
  • Damage counters, a coin and something to mark conditions, in case your store doesn't supply them
  • Toploaders or a small binder for anything good you pull
  • Your Play! Pokémon player ID if the store runs it as an official event: ask when you book
First prerelease?New to the game? Our how to play the Pokémon TCG guide covers turns, Energy and Prize cards. A prerelease is a good first event, and store staff are used to teaching.

07 · Missed it?

If you can't make a Delta Reign prerelease

The Build & Battle Box goes on general sale when Delta Reign releases on 6 November, so you can play the format at home with a friend: each of you opens a box and builds a 40-card deck.

Delta Reign Build & Battle BoxFour packs, a 40-card deck and one of four promos. We'll list it when stock is in.
View the box

08 · Our take

Which promo deck we'd want

Our take

Magmortar is the fun one. Buddy Boost into a big Voltaic Hammer is easy to understand and hits hard, which suits a format where games are short and the board stays small.

Enamorus has the highest ceiling but the hardest set-up, because it needs four specific Pokémon in play from a 40-card deck. Masquerain depends on what sits at the bottom of your deck, so it can swing either way. Kommo-o is the most self-sufficient: one Ability that keeps loading Energy, and one big attack.

Whatever you get, sleeve the promo before your first game: it's the card you'll want to keep.

09 · FAQ

Delta Reign prerelease FAQ

When are the Delta Reign prereleases in the UK?
From 24 October 2026 at select Play! Pokémon stores. PokeBeach reports the window ends on 1 November.
What is in a Delta Reign Build & Battle Box?
Four Delta Reign booster packs, a 40-card ready-to-play deck and one of four foil promos: Masquerain, Magmortar, Enamorus or Kommo-o.
How many cards is a prerelease deck?
40 cards, with four Prize cards instead of six.
Can I choose which promo I get?
Pokémon's preview says the deck depends on which promo you get, so treat it as a surprise.
Can I buy a Build & Battle Box without going to a prerelease?
Yes. They go on general sale on 6 November 2026, when Delta Reign releases.
Where do I find a prerelease near me?
Ask your local games shop whether it's a Play! Pokémon store running Delta Reign events. Each store sets its own dates.

Sources

Card and product images: The Pokémon Company International. Card text is quoted from the official card images. The prerelease end date comes from PokeBeach and isn't confirmed by The Pokémon Company.