How to i get these pokemon without action replay?

Question

Mew & mewto

Answer 1

Mewtwo you get by migrating from fire red or leaf green. Mew is an event only pokemon and you'd have to have gotten it during an event and then migate it. If not you'd have to have someone trade it to you.

Answer 2

You'll have to migrate from Leafgreen or Firered

Answer 3

migrate from fire red or leaf green

for mew have a friend trade it to you then trade it back then look for it in the gts