For the second Time since the Second Generation, the Pokemon Company has again adjusted certain Base Stats for a number of different Pokemon. Many factors go into the reason why they do this, but the main factor is considered to be to make these Pokemon more relevant in the present-day meta game.
Updated Stats
Arbok: Attack 85 --> 95
Dugtrio: Attack 80--> 100
Mega Alakazam: Special Defense 95 --> 105
Farfetch'd: Attack 65 -->90
Dodrio: Speed 100 --> 110
Electrode: Speed 140 --> 150
Exeggutor: Special Defense 65 --> 75
Noctowl: Special Attack 76 --> 86
Ariados: Special Defense 60 --> 70
Qwilfish: Defense 75 --> 85
Magcargo: HP 50 --> 60 Special Attack 80 --> 90
Corsola: HP 55 --> 65 Defense 85 --> 95 Special Defense 85 --> 95
Mantine: HP 65 --> 85
Swallow: Special Attack 50 --> 75
Pelipper: Special Attack 85 --> 95
Masquerain: Special Attack 80 --> 100 Speed 60 --> 80
Delcatty: Speed 70 --> 90
Volbeat: Defense 55 --> 75 Special Defense 75 --> 85
Illumise: Defense 55 --> 75 Special Defense 75 --> 85
Lunatone: HP 70 --> 90
Solrock: HP 70 --> 90
Chimecho: HP 65 --> 75 Defense 70 --> 80 Special Defense 80 --> 90
Woobat: HP 55 --> 65
Crustle: Attack 95 --> 105
Beartic: Attack 110 --> 130
Cryogonal: HP 70--> 80 Defense 30 --> 50