I was bored so I gathered a list of which Mega, Legendary, and "normal" Pokemon are strongest/weakest in each stat

"NORMAL" POKEMON LOWEST STATS

HP- Shedinja (1)

Attack- Chansey and Happiny (5)

Defense- Chansey and Happiny (5)

SpecialAttack- Feebas, Bonsly, and Shuckle (10)

SpecialDefense- Carvahna, Igglybuff, Weedle, and Caterpie (20)

Speed- Shuckle and Munchlax (5)

Total- Sunkern (180) (This isn't as impressive as it sounds. All of its stats are thirty)

"NORMAL" POKEMON HIGHEST STATS

HP- Blissey (255)

Attack- Rampardos (165)

Defense- Shuckle (230)

SpecialAttack- Blade Form Aegislash (150)

SpecialDefense- Shuckle (230)

Speed- Ninjask (160)

Total- Slaking (670)

MEGA POKEMON LOWEST STATS

HP- Alakazam (55)

Attack- Alakazam (50)

Defense- Absol (60)

SpecialAttack- Beedrill (15)

SpecialDefense- Absol (60)

Speed- Sableye and Camerupt (20)

Total- Mawile (480)

MEGA POKEMON HIGHEST STATS

HP- Mewtwo X and Mewtwo Y (106)

Attack- Mewtwo X (190)

Defense- Aggron (230)

SpecialAttack- Mewtwo Y (194)

SpecialDefense- Latias (150)

Speed- Aerodactyl and Alakazam (150)

Total- Mewtwo X, Mewtwo Y, and Rayquaza (780)

LEGENDARY POKEMON LOWEST STATS

HP- Deoxys-Defense (50)

Attack- Regice (50)

Defense- Deoxys-Attack (20)

SpecialAttack- Deoxys-Defense (70)

SpecialDefense- Deoxys-Attack (20)

Speed- Hoopa Confined (70)

Total- Therian Form Tornadus (580)

LEGENDARY POKEMON HIGHEST STATS

HP- Both Giratina Forms (150)

Attack- Primal Groudon and Deoxys-Attack (180)

Defense- Regirock (200)

SpecialAttack- Deoxys-Attack (180)

SpecialDefense- Regice (200)

Speed- Deoxys-Speed (180)

Total- Primal Groudon and Primal Kyogre (770)