GenI: Tauros.
GenII: Heracross, Corsola, (Smeargle), Shiny Lugia (and Celebi).
GenIII: (Nincada, Ninjask, Shedinja), Illumise, Torkoal, (Spinda), Vibrava, Flygon, Solrock, Kecleon, Tropius, (Clamperl, Gorebys, Huntail), Relicanth, Salamence, (Regirock, Regice, Registeel, Deoxys and Jirachi).
8 Regionals
14 Unreleased
1 Unobtainable Shiny (which counts for me since it isn't available anymore).
3 Obtainable evolutions (for which I already have candy enough for, just waiting for the right IV's to come along.
Technically speaking I already have a Shelgon with perfect Attack and HP, but since Salamence is quite the investment (those Bagon are really hard to come by, and the bulk of my Bagon candy was because I had the sensibility to gather and hatch 10k's during the double candy event - instead of going through dozens of 2k's which result in less candy per egg), I'm holding off evolving that Shelgon until I hatch another batch of 10km eggs and if there isn't a better Bagon in that batch, then I'll evolve that Shelgon since 15 Attack is basically all it needs (though being above 90% would give me less regret of powering it up, because when I eventually do get a better one, I'll feel that regret).
Obviousy, I'm quite upset about a few of the most recent events, the Kanto Festival and the Fighting-type Gym Clash. They were specifically marketed as the following: "Complete your Kanto Pokédex!".. I ASK YOU HOW NIANTIC WHEN YOU KEEP THE REGIONALS IN THE SAME PLACE?!? ALL I NEEDED WAS TAUROS, YOU MORONS. And as for the Fighting-type Clash, yeah, Heracross as a worldwide Raid Boss, or unlocked after a certain amount of gym battles were done during a certain period would've been a nice touch. I really, really liked the worldwide grind for Farfetch'd, so I don't get why they didn't do such a thing for Heracross.. Oh wait.. GoFest had Heracross as a unique spawn so US-citizens with able opportunity (or just plainly living in the south) don't have to fret about that one - so Niantic will never bother with it worldwide.
Adventure Week 2018 is about to begin on Saturday... I'm willing to bet that with "increased Rock-type spawns", we will still not see Corsola or Relicanth where I live.. and we'll probably not see Torkoal while Chicago is having their GoFest even though they announced global tie-ins (which is probably the Celebi Special Field Research reveal).