in route 44 . you have to surf to a patch of grass .but you can catch it only in the day
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You can find one on Route 44.
Go to the route that takes you to Veilstone City and find a Lickatung. Then teach it rollout and there you go.
You can catch in a swarm in Lake Valor, or just migrate from Fire Red/Leaf Green.
You can't find Mew in Pokémon Silver.
When Lickatung learns either Double Hit or Ancient Power, and you level it up with it knowing that move.