-Togepi (Bugs) (Must always know metronome)
-totodile (Jaws) (evolve the first time by soloing sprout tower, evolve the second time by soloing Morty and another trainer in his gym)
-Odd egg (Must be shiny)
-Sandshrew (Digdig) (You have to teach it Fury Cutter via TM after beating Bugsy and can't forget it either. To evolve, it must chain at least 5 Fury Cutters against 3 trainers, beating them. Its moveset for the E4 must be Dig, Fury Cutter, Slash and Cut.)
-Eevee (Sunring) (Must evolve into Umbreon when it learns Bite at Level 30. Must be male.)
-Growlithe (Arcana)She must be caught before fighting Falkner (I believe that is possible in Crystal if memory serves, a patch of grass was added above the ruins of alph) and solo Bugsy. If you can't catch her before, ignore those restrictions. It must evolve when you get your fire stone.)
Now on to Yellow!!