All 151 Pokemon are obtainable in some way or another, as well as the original 151. Professor Oaks tests out your skills by lending you a Pokemon in order to capture the Pikachu at the begining. Trainer boys has a Slowpoke which will activate the glitch on that route). Plot: The plot is basically Pokemon Yellow remade. Anne, then grab the Teleport TM on your way to Rock Tunnel, teach it to some Pokemon, and finish off the glitch that way (unless you already goofed and beat all the trainers on the way to Bill's house and planned on doing it with the first swimmer in Misty's gym, as one of the the Jr. You can always try a longer-ish way to do the early Mew glitch, beat Misty and go and get Cut from the S.S. r/ThunderYellow: This is an in progress hack of Pokmon Fire Red version where Pikachu. It's also possible that, with the extra pokemon that (I assume) show up in that area along with Abra the encounter rate got a little fucked somewhere and he just doesn't show up, or has some stupid low rate. There are only 20 watches being made, so be quick if you’re looking to spend some serious money on a watch with a Pokémon on it. The encounter rate for Abra is around 15% in those areas, according to Bulbapedia, so it's entirely possible you just haven't gotten lucky enough to encounter one.