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Features suck to be cut yes but the Pokémon are what really matter at the end of the day.
Seems innocuous at first glance but this was the first real time (barring excusable hardware limitations) that a Pokémon given to us to raise was completely taken away from us in the following generation. It set a precedent for what would become Dexit.
Cosplay Pikachu was next. Literally a part of the game advertised as new and special on the game box taken away once Bank hit with no explanation.
Both of these were left behind simply because GameFreak didn’t want to model them each generation.
Next the totems. Then Special Partner Pikachu. Then all of the special hatmons in GO. They’ve been slowly cutting Pokémon from the games, and LGPE cutting everything but the original 151 stems directly from no one confronting them about cutting pichu, cospika, the totems, etc.
This was the natural way things were always going to go.