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.
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At level 33 Lickitung learns Rollout. That move is required for it to evolve into Lickilicky, eventually at level up, it should evolve into Lickilicky.
In SoulSilver, Lickitung will evolve into Lickilicky once it levels up while it knows the Rollout move. In SoulSilver, Lickitung learns Rollout at Level 33.
Lickitung evolves into Lickilicky when it learns Rollout at level 33.
it will evolve at lvl 25
You can't on leafgreen.