Generally speaking, Constructed formats have a minimum deck size of 60, but there are exceptions to this rule
Pikachu ex is the main threat from this deck : the CPU opponent prioritizes using Pachirisu to add Energy, then Pikachu ex to attack, and back to Pachirisu, without ever using Pawmot unless the other Pokemon are absent.
Power level wise the card fits in just right in Modern, as there are a lot of threats which go under the card, and cards like Veil of Summer and Cavern of Souls give slower creature/combo decks enough counterplay against it
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Some obvious candidates come to mind, with the Power Nine being the first and foremost ones