Let the challenge begin!
Scramblemons:
Burrows the eevee, must learn and keep bite and dig, become flareon at lvl 30, must solo either Red's Pikachu or Blue's Gyarados;
RageMuscle the Machop, must solo Whitney's Miltank with Frustration, cannot become Machamp while knowing frustration;
Electrode (any name), caught in the rocket base, must know Torment and participate in every major rocket battle, can only forget torment after team rocket is defeated;
Mach the Pidgey, must always have a priority attack, participate in first gym battle, and fight every spearow/fearow seen, can fight no pure ground types, must kill 5 pidgey/fearow to evolve once, and 10 fearow/pidgeotto to evolve twice;
MooMoo the Miltank, cannot attack until eating 10 Oran Berries, must heal or switch after attacking directly, restrictions are removed if heal bell's PP is used completely in an elite four battle;
Fang the Totodile; must learn and keep bite and ice fang, must solo 10 pokemon using those moves to evolve once, and 20 more to evolve again, but can never learn surf.