Alright, I'll give ya a step-by-step.

Step 1- go through the poke'dex until you find something you think you can tolerate. Do not pick a Swirlix.

Step 2- ask a buddy or use the guide to see where they live.

Step 3- get the monster you hate the least to beat up the monster you want, throw a poke'ball at it, and call it a day.

_{[Move over Prof. Oak.]}