There is a trainer with Masquerain in Pokémon Emerald, however, he doesn't use it until you're battling him for the 2nd time using the PokeNav. You'll know you've challenged him enough when his Surskits are level 34. The trainer is Bug Maniac Jeffrey and can be found on Route 120.
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There is no Trainer Hill in Pokemon Ruby. Trainer Hill is only in Pokemon Emerald.
Taillow, Swablu, Gligar, Rayquaza, Trophius, Masquerain.
Pokemon's ID is your Trainer Card ID!
unfortunately there is no trainer with a chikorita for you to see. You have to trade it from an emerald cartridge.
Evolve Surskit.