gen 1: mewtwo
gen 2: either quilava or scizor
gen 3: hariyama
gen 4: leafeon
gen 5: maractus (emboar and keldeo ARE close seconds...)
gen 6: either trevenant or hoopa
gen 7: either tapu koko or mimikyu
gen 8: dracozolt
gen 9: iron valiant (tinkaton is a close second...)

my tastes are like. all over the place when it comes to pokémon.