Birth! Z Tretta!! (Tretta)

Birth! Z Tretta!! is the first set of the Pokémon Tretta Ultimate Z series, a continuation of the Pokémon Tretta Ultimate series with particular focus on the Legendary Order Pokémon Zygarde in its constituent forms. This series introduces Z Tretta, which have additional capabilities such as the ability to summon Pokémon to aid a player in Battle Mode, similar to the role of Advent in Pokémon Battrio, or the ability to change their form. Z Tretta are identified with a icon. Birth! Z Tretta!! features Zygarde in its 50% Forme as an Ultimate-class and a Hyper-class Tretta with the Z Tretta ability, which allows Zygarde to transform into its Complete Forme when its HP drops below half. The Legendary beasts Raikou, Entei, and Suicune are also featured as Master-class Tretta with the Z Tretta ability. Each member of the trio have a chance to summon either of the other two members if used in Battle Mode, but if all three are used together, the Legendary Rainbow Pokémon Ho-Oh will always be summoned. Additional Pokémon summoned via the Z Tretta ability will attack after the conclusion of Round 3 in Battle Mode. If the player has any Extra Attackers, any Z Tretta-summoned Pokémon will attack afterwards.

The numbering system for the series prefixes the set number with "Z", which reverts to 1 with this set. Another cross promotion with the Pokémon anime also begins with this set, with Shiny versions of two members of the aura trio, Xerneas and Yveltal, featured as Legend-class Tretta following the availability of their core series counterparts prior to the set's release. Another Pikachu based on the one belonging to Ash Ketchum is featured as a Master-class Tretta, as are a Shiny Metagross and Charizard capable of Mega Evolution. These Pokémon are based on those belonging to Steven Stone and Alain from the Mega Evolution specials respectively. Other Pokémon capable of Mega Evolution in this set include Abomasnow and new addition Aggron.

Location icons in Search Mode may feature sparkles if a high-class Pokémon will be encountered there, a new feature from this set. Locations also have a winter theme, with Foot replacing Ruins from the last set.

Birth! Z Tretta!! also introduces Tretta with one-hit knockout moves, identified by red text on a move segment. Much like their core series counterparts, their accuracy is considerably lower compared to that of regular attacks, but a successful hit will fill the Catch Gauge of an opposing Pokémon completely.

Challenge Battle includes five new line-ups for players to compete against, including two new Tretta Leaguer types, Naughty Leaguer and Tretta Doctor. Tretta Idol Hitomi and Top Leaguer Tatsuya return, but this time as the 4-star and 5-star challengers. Players with Tretta Reports could also add the Aura Pokémon Lucario and Legendary Alpha Pokémon Arceus to their Extra Attacker roster through repeated play.

Challenge Battle Tretta Leaguers

Corporate Warrior Imura きぎょうせんしのイムラ Difficulty: ★☆☆☆☆ Croagunk Poison Jab Dragalge Poison Tail Foongus Sludge Bomb

Naughty Leaguer Kenji わんぱくリーガーのケンジ Difficulty: ★★☆☆☆ Druddigon Dragon Claw Noivern Boomburst Tyrunt Dragon Tail

Tretta Doctor Akiko トレッタドクターのアキコ Difficulty: ★★★☆☆ Wobbuffet Counter Genesect Techno Blast Golurk Shadow Punch

Tretta Idol Hitomi トレッタアイドルのヒトミ Difficulty: ★★★★☆ Mega Tyranitar Stone Edge Hoopa Hyperspace Fury Mega Gyarados Waterfall

Top Leaguer Tatsuya トップリーガーのタツヤ Difficulty: ★★★★★ Reshiram Blue Flare Kyurem Glaciate Zekrom Bolt Strike