Tier List of Strongest Pokémon Across All Game Boy Games

S-Tier:

1. Mewtwo (Red/Blue/Yellow)
   • Exceptional stats and access to powerful moves like Psychic and Ice Beam.
2. Dragonite (Red/Blue/Yellow)
   • High base stats, versatile move pool including Thunderbolt and Hyper Beam.
3. Tyranitar (Gold/Silver/Crystal)
   • Strong stats and moves like Crunch and Rock Slide, plus Sandstorm ability.
4. Lugia (Gold/Silver/Crystal)
   • Great stats, tankiness, and powerful moves like Aeroblast and Psychic.
5. Ho-Oh (Gold/Silver/Crystal)
   • High stats and access to Sacred Fire, a strong STAB move.

A-Tier:

1. Snorlax (Red/Blue/Yellow)
   • Great HP and Attack, can learn moves like Hyper Beam and Body Slam.
2. Alakazam (Red/Blue/Yellow)
   • High Special Attack and Speed, excellent with moves like Psychic and Recover.
3. Blissey (Gold/Silver/Crystal)
   • Massive HP and Special Defense, useful for stalling and support.
4. Heracross (Gold/Silver/Crystal)
   • Strong Attack and unique Bug/Fighting type, great with Megahorn and Earthquake.

B-Tier:

1. Gengar (Red/Blue/Yellow)
   • High Special Attack and Speed, useful with moves like Shadow Ball and Hypnosis.
2. Machamp (Red/Blue/Yellow)
   • Great Attack and access to powerful moves like Cross Chop and Earthquake.
3. Charizard (Red/Blue/Yellow)
   • Good stats and movepool, including Flamethrower and Earthquake.
4. Zapdos (Red/Blue/Yellow)
   • Strong stats, Electric/Flying type, and access to Thunderbolt and Drill Peck.

C-Tier:

1. Jolteon (Red/Blue/Yellow)
   • High Speed and Special Attack, good with Thunderbolt and Pin Missile.
2. Starmie (Red/Blue/Yellow)
   • Versatile stats and movepool, effective with Surf and Thunderbolt.
3. Scizor (Gold/Silver/Crystal)
   • Great Attack and Defense, useful with moves like Metal Claw and Wing Attack.
4. Kingdra (Gold/Silver/Crystal)
   • Balanced stats, useful Dragon/Water typing, strong with Surf and Dragonbreath.

This tier list ranks Pokémon based on their overall effectiveness in battles, considering their stats, movepools, and abilities. These Pokémon stand out across the Game Boy titles for their strength and versatility.