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We know that pokemon have egg moves, say, we know Wobafett can breed with Koffing, but we don't know what egg move it will give you, do we? It would be
helpful if we could tell which egg move you got from breeding ____ with ____.
Well, you could suggest it, there's a thread for that! Until that is implemented (or if it's not), you could always use the search function to see what other Pokémon in that group get that move naturally.