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Bug is my favourite because it's the early game type, the Pokemon you're supposed to catch early on, evolve quickly, then box when the better stuff becomes available, but I get attached to the guys I catch early on and will try to use them long after the game makes them obsolete. Also I just like the insect look.
Heracross is my #1 favourite Pokemon, while Genesect is the only Bug-type event-only Pokemon, making it the worst by default.
Dragon is my least favourite type for pretty much the opposite reasons. They're placed later in the games in hidden out-of-the-way areas with low catch rates and needing high levels to evolve all in order to justify their objectively awesome stats, but by that point I'm only catching stuff to fill up the dex, not to add to my team. Also they're ugly looking.
Gibble is one of the very few Dragons I consider cute, while Salemence is so ugly I have to choose it over any the legendary Dragons, who aren't all that bad as far as legends go considering Gamefreak wants to show them off and will practically throw them at you.