Well, I'm afraid you cannot get Mimic in Pearl; Mimic is not a TM. But some Pokémon can learn it, if that's what you mean. In which case, the following can learn Mimic:
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Mimic is not a TM. In HG/SS, there is also no Move Tutor that teaches Mimic.
In lavaridge town, next to the herb shop. Ask the kid, and he will offer to teach one of your Pokemon mimic.
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What is the pokemon pearl ID?
There is no mime jr. on Pokemon pearl. On diamond there is mime jr. on Pokemon pearl there is bonsly