I really don't get the hype about Fire Blast on M-Houndoom. If you pick the right moment to switch in and get a NP and possibly a flash fire, like you should, you're perfectly able to sweep with Flamethrower, without the risk of missing.
Besides that, as Fire/Dark has no single-type blind spots, I'd rather pick HP Ice as my 4th move, as it has great 4x strenghts against some really bulky opponents and helps you OHKO a non-scarfed Hydreigon or Krookodile, that could otherwise force you to switch out and lose your boosts.
Besides that, as Fire/Dark has no single-type blind spots, I'd rather pick HP Ice as my 4th move, as it has great 4x strenghts against some really bulky opponents and helps you OHKO a non-scarfed Hydreigon or Krookodile, that could otherwise force you to switch out and lose your boosts.