Well, Blaziken has always been a fan favorite. I guess I would rank them in this order: Blaziken (Torchic), Sceptile (Treeko), Swampert (Mudkip). However, in the upcoming newer games where each get a Mega Evolution, Swampert would be my choice.
I would say Kyogre is the best of the Hoenn Legenday Trio. It's incredibly strong with Water Spout, Ice Beam, Thunder, and Surf.