Why did Showdown! say that it's illegal for Ash-Greninja to have Cut?

Question

It says in Pokemon Showdown! it’s illegal to teach Ash-Greninja Cut, but, for regular Greninja, it is possible. I’m so confused.

Answer 1

I've never played (Ultra) Sun/Moon, so I don't know for sure if there's no HM moves in the games, but I can't find any. I believe that is the reason.

In Generation 6 (X, Y, Omega Ruby, Alpha Sapphire), there ARE HMs, and Greninja can learn some of them: Cut, Strength, Waterfall, and Surf.
Source: PokemonDB's Greninja moves list.

However, on the move list for Greninja in Sun/Moon, cut does not appear at all. Since Ash-Greninja is Generation 7 exclusive, cut is not possible for him to learn in-game.

Because of this, It cannot learn cut on Showdown!.

This is the reason that makes the most sense. However, even that leaves something to be desired.
Like I said, I haven't played Sun/Moon, but I think that it is possible to move your Pokemon from the Gen 6 games to the Gen 7 games. If this is possible, my idea should be thrown out. If not, then my reason is probably right.

Comments

The reason why geninja can learn cut is gen 6, and can be transferred up, ash-greninja cannot be transferred down and, therefor cannot learn cut. In other words, your right.

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Cool. Works with me.