Hydreigon was fazed out due to typing primarily, haxorus dropping i did'nt even know about
The main thing I was aiming for is that if one of Politoed or Ninetails dropped (even though it would never happen in gen5), would smogon drop them to BL? they are not that strong and honestly are 1-dimensional as a weather starter, so if they did drop to UU, can you imagine the other pokemon that would too?
Last I saw, Politoed and Ninetales were actually NU! Rather than ban the Pokemon themselves, Drizzle and Drought were banned in NU and RU (not sure about UU, but I can't imagine it would have been).
All weather starting abilities are banned outside of OU except for Hail (Abomasnow) and Sand (Hippopotas).
I thought i stated it was gen 5
You did not. All weather forms were banned to OU in Gen 5 iirc. Sun and Rain were banned from lower tiers because that is where a majority of the Pokemon down there get a large source of their power.