1. Luftballon
Banned
- Pronoun
- it
I don't see the point in prohibiting Ghost monos in RBY. It's possible to beat the game with six Gengar if you want. Of course, it's going to be a little difficult getting past Psychic-types, but that's what powerleveling is for, right?
In Platinum you theoretically could do a Fire monotype, just catch another Houndour/Ponyta/Magby... If you're really anal about species clause, you could use both Magmar and Magmortar in a relatively strong party.
that you can't get any ghosts before ... minimum two, probably three, not unlikely four, not implausibly five, (maybe six, cba to check) gyms in, off the top of my head, and even then you have a choice of exactly one pokémon? (which is haunter, unless trading.)
ice doesn't happen until seafoam, I don't think, but dragon is available at more or less the same time as ghost and has the same amount of variety (and dragonite and dragonair are quite usable, too).
and psychic and rock can't be don't before brock, but at least both are doable before misty.
bug variety is actually decent starting from early-game, grass likewise; both fail mid-game, but. electric leaves you stuck with pikachu against brock, so you're screwed until level 16/11, have fun!