booster box set pokemon Pokémon: Glory of Team Rocket (Korean) in the Pokémon TCG Proxie 1st Edition Base Set

What is the reason for this

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It's a 2/2

You need three energy to use this ability, but that's less than some of the best Pokmon TCG Pocket moves - in particular Mewtwo Ex's or Charizard Ex's devastating attacks

While its likely that with or without Yata-Garasu we would have eventually seen a banlist in the game (every game faces this issue eventually as its near-impossible to balance a game with that many cards for so many years, and other cards were a threat), its no surprise that this bird was the card turning this eventuality into a necessity, and that even today the 2003 Yata-Lock era is looked back upon with trepidation.

12) If yes to 3 or 6, what is the change of each of the relevant threshold cards