>>35292683Gen 1
Nidos, Alakazam, Dugtrio for the midgame
Gen 2
Feraligatr, Typhlosion very early and lategame (though it flags midgame), Golem
Gen 3
Swampert, no contest, nothing else comes close, but Electric types will carry you through much of the water and flying filled lategame
Gen 4
Infernape, Staraptor, Bronzong (it ain't efficient, but it tanks so much shit), Heracross for HGSS
Gen 5
Excadrill, Stoutland in the first half
Gen 6
Mega Lucario, Mega Charizard (either), Azumarill (in both XY and ORAS)
Gen 7
Mudsdale, A-Muk, heard good things about Furfrou and Hawlucha in USUM as well