I'm at the the beginning of Pokémon Pearl. How should I level up quick?

I just got my Pokémon and caught another Pokémon. Now how do I level up quick. Lvl. 7 Chimchar Lvl. 4 Starly or:I just got my Pok\u00e9m

I just got my Pokémon and caught another Pokémon. Now how do I level up quick. Lvl. 7 Chimchar Lvl. 4 Starly

or:I just got my Pok\u00e9mon and caught another Pok\u00e9mon. Now how do I level up quick. Lvl. 7 Chimchar Lvl. 4 Starly

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