Tier 1 is way overstating Chandelure. It is somewhere in the middle of the Ghost type pack, not having Gengar’s DPS or Giratina’s TDO. Also, Fire-type Pokémon don’t tend to get a lot of use in relevant raid bosses. I would personally put it on Tier 1.5.
Sceptile is not better than Roserade, but the gap between them is a minimal 1%. So to me, it isn’t justifiable to put them four tiers apart. Roserade’s placement is fine as it is, but Sceptile should be on Tier 3.5 minimum in my opinion.
I feel like Magnezone is way underrated nowadays. Few if any people ever seem to pay attention to its type resistance list, the highest of any Pokémon in history. This includes Flying, Electric, Rock, Psychic, Grass, Ice, and it just goes on and on. Its DPS isn’t bad either, and on Raikou’s level, as a regular non-legendary Pokémon. To me, the ideal placement for Magnezone should be Tier 2.5 or 3.