That's a lot better than 2-1-2. That's currently the line I use in Magneboar (though I would love to fit a third Boar sometimes). It should be okay given that Feraligatr isn't as critical late game, seeing as once you get a lot of energy in circulation with Blastoise, it tends to stay there, unlike a Reshiram/RDL that discards or a Magnezone that hurls energy into the lost zone.