I want there to be a baby Pokemon that's stronger than it's evolutions. They almost kinda did that with the Trapinch line, since it's an antlion that actually loses attack when it evolves the first time. Like how real life predatory antlions are just larvae who turn into damselflies.
They should make a Bug/Flying type based on a delicate damselfly, kinda useless on purpose like your typical early gen bug. But have it always found near the water because that's where they like to reproduce.
Then make it so that there's a baby form you can only get by breeding two with an item or in a certain location or something. Make it an antlion/doodlebug but instead of sand traps it makes whirlpools and it's just this giant larvae monster that has way higher stats than its parents. But it's pure Bug-type.
And call it Doodeluge.