I despise all the starters after Gen 4, but Rillaboom is the one I hate the most because of how they took an awesome concept (drummer gorilla) and fucked it up completely.

Like, they really went through the process of designing this thing and then near the end they thought "yep, let's just ruin it by adding this single strand of hair down its face and slap this toy drum set on it". They really can't just have animal-like starters anymore, they need to always slap some stupid human characteristic on it because they think it appeals to fans more.