It could also be because Pikachu uses a surf board in Let's Go, more as a nod.
Here's a big one: Enamorus (Legends) is Fairy/Flying... with ZERO Flying moves, not even Gust, Air Slash or Hurricane...
Its actually similar with Thundurus and Landorus who get very limited flying moves despite being in way more games. At least Enamorus has the excuse of only being in a game with a limited movepool. The only member of the forces of nature who gets a variety of flying coverage is Tornadus . I guess because its the pure flying one and thus has no other moves of its type they decided to not give the other members much. But that has always seemed odd to me.
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