been interested in these things for a while... I'm no good a set making, but I heard about a sort of bug legendary?
how about an end-game quest? (or many, to introduce other poke's you make...)
a certain type of bug pokemon (one of the SWFdex ones) starts acting up. While never having been seen before, it suddenly starts appearing on every route in the game (except while surfing). It has a unique attack that calls for aid (turns the battle into a double battle). The player must catch one and then use the attack outside of battle. One of the bugs will fly from offscreen and initiate a fight. defeat this, then walk in the direction the bug came from. continue this to eventually find a cave (inaccessible until beating the story and the Elite Four). enter the cave (pokemon inside include generic ghost-types, poison-types, rock-types, and many of the bugs). upon traversing a large maze, the player finds a bug-queen-pokemon (kinda the Zerg Overmind). it is bug/psychic (or bug/dark, bug/drag., bug/???, whatever) and has with the same special attack the bugs use. it is at level 50 (maybe 70?) and fights the trainer. Defeating/catching it ends the quest. after that, the player can return to the hive at any time, and this is the only place (along with the grass near the entrance) where one can find the bugs. (the attack no longer works outside of battle).
Maybe this'll be my first Contribution? what do y'all think?
Oh. and new group. hands-down. Team rocket is too overdone, Magma/Aqua wouldn't fit the scenario, and Galactic was a lame buncha' cross-dressers. and Noone cares about team Snag'em.