mostly baby pokemon and other kinds nobody uses, cleffa, magby, Those 3 elemental monkeys, you might not forget there design, but probably their names. Pinsir, because it doesn't evolve, Phione, cause of its rarity and similiar appearence to manaphy. Either tauros or buffoulant, because of there similiar appearence and typing. Porygon because of its absense in the anime, relicanth. and probably several others.