When Lickatung learns either Double Hit or Ancient Power, and you level it up with it knowing that move.
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If this is a generation three or earlier game, then Lickitung doesn't evolve, and you can't get Lickilicki (The evolved form of Lickitung). This is because Lickilicki is a generation four Pokemon and didn't exist at the time Fire Red and Leaf Green were released, because they are generation three. If you want to know about Diamond, Pearl, Platinum, HeartGold or SoulSilver, then Lickitung evolves while leveled up and knows rollout. Lickitung learns rollout at level 30, so when yours reaches that point, let it learn rollout, and then raise it another level. It will evolve into Lickilicki.
how to get a togepi in Pokemon platinum
There is no grunt that you can give a Pokemon to in Pokemon platinum.
That pokemon is Azumarill in pokemon platinum in the national pokedex
No, you cannot get Jirachi in Pokemon platinum.