He goes extremely fast outside battle if I use it and in battles it does some damage...? I guess it's better than Flare Blitz, since that would do damage to the user too.

But the other move, Heat Wave is very cool! Growlithe learns it... [Thinking!] ...Somewhere around level 45 and it comes before Flare Blitz, so you could also have it and evolve your Growlithe before it learns Flare Blitz if you don't want that move.

[Pikachu gets all excited and waves like crazy to the two.]