Pokémon Pearl: here pichu pichu

Finally caught a pichu this morning, after wandering around the garden of the Pokémon Mansion for ages and ages. I'd seen one when I first went in, but Kricketune, not knowing its own strength, knocked it out with one hit. After that I saw loads of starlies, staravias, kricketunes, and even pikachus, but it was only this morning that I finally got a pichu. So I'm on the way again, and I'm a bit concerned that my team is a little too levelled up for capturing wild pokémon ...