>>56765382When possible, I like doing monotype runs, the problem is usually availability of the correct types early on for a true run. Monopoison is my favorite but actually doing one is actually pretty fucking rough in most gens because of poor availability. Monofire also in most games is hell, being just your starter for ages, while Water always has a piss easy time, and fuck doing a mono-ice run without trading.
>>56765794Kanto has a pretty solid spread with good availability, though, only Johto [which has Kanto's with a few add ons] is really better particularly around Gen 4.
Poison is one of those types that has always had a pretty decent mix of bodies and coverage for a varied couple of play styles or aesthetic tastes. It's biggest issue was typing, which got a tune up later admittedly. But no type with the Nidos in it is hurting for options really.