Delta Reign releases on 6 November 2026 as the sixth expansion in the Mega Evolution series, Pokémon has announced. Most of its cards come from the Japanese set Storm Emeralda, released on 31 July. Prerelease events run from 24 October to 1 November.
Mega Rayquaza ex brings back one of the best-known Mega Evolutions. The last new Mega Rayquaza card appeared in XY – Ancient Origins; the 2021 Celebrations collection only reprinted the older M Rayquaza-EX from Roaring Skies. The set also includes Mega Golurk ex, Mega Golisopod ex and Mega Malamar ex.
| Cards | 135+ |
| Mega Pokémon ex | 4 |
| Other Pokémon ex | 6 |
| Trainer cards | 20+ |
| Special illustration cards | 35+ |
| Illustration Rares | 14 |
| Ultra Rares | 17 |
The figures come from PokeGuardian. New are Legendary Stadiums: three Stadium pairs whose two halves are played together and form one continuous picture side by side. So no one is left hunting for a missing half, a booster with one half always contains the other. Legendary Summit was the first pair revealed and appears twice in Serebii's list.