According to Serebii several older mons have had certain base stats altered. To date, all of these are stat increases, which may improve their viability in the metagame.
http://serebii.net/xy/updatedstats.shtml
For the sake of convenience, here is a short list of which mons base stats have been altered that we know of, thus far:
Butterfree: Special attack increase from 80 to 90
Beedrill: Attack increase from 80 to 90
Pidgeot: Speed increase from 91 to 101
Pikachu: Defense increase from 30 to 40 and a special defense increase from 40 to 50
Raichu: Speed increase from 100 to 110
Nidoqueen: Attack increase from 82 to 92
Nidoking: Attack increase from 92 to 102
Clefable: Special attack increase from 85 to 95
Wigglytuff: Special attack increase from 75 to 85
Vileplume: Special attack increased from 100 to 110
Poliwrath: Attack increased from 85 to 95
Alakazam: Special defense increase from 85 to 95
Victreebel: Special defense increase from 60 to 70
Golem: Attack increase from 110 to 120
Ampharos: Defense increase from 75 to 85
Azumarril: Special attack increase from 50 to 60
Jumpluff: Special defense increased from 85 to 95
Exploud: Special defense increase from 63 to 73
Staraptor: Special defense increase from 50 to 60
Roserade: Defense increase from 55 to 65
Stoutland: Attack increase from 100 to 110
Unfezant: Attack increase from 105 to 115
Gigalith: Special defense increase from 70 to 80
Seismitoad: Attack increase from 90 to 100
Scolipede: Attack increase from 90 to 100
Krookodile: Defense increase from 70 to 80
http://serebii.net/xy/updatedstats.shtml
For the sake of convenience, here is a short list of which mons base stats have been altered that we know of, thus far:
Butterfree: Special attack increase from 80 to 90
Beedrill: Attack increase from 80 to 90
Pidgeot: Speed increase from 91 to 101
Pikachu: Defense increase from 30 to 40 and a special defense increase from 40 to 50
Raichu: Speed increase from 100 to 110
Nidoqueen: Attack increase from 82 to 92
Nidoking: Attack increase from 92 to 102
Clefable: Special attack increase from 85 to 95
Wigglytuff: Special attack increase from 75 to 85
Vileplume: Special attack increased from 100 to 110
Poliwrath: Attack increased from 85 to 95
Alakazam: Special defense increase from 85 to 95
Victreebel: Special defense increase from 60 to 70
Golem: Attack increase from 110 to 120
Ampharos: Defense increase from 75 to 85
Azumarril: Special attack increase from 50 to 60
Jumpluff: Special defense increased from 85 to 95
Exploud: Special defense increase from 63 to 73
Staraptor: Special defense increase from 50 to 60
Roserade: Defense increase from 55 to 65
Stoutland: Attack increase from 100 to 110
Unfezant: Attack increase from 105 to 115
Gigalith: Special defense increase from 70 to 80
Seismitoad: Attack increase from 90 to 100
Scolipede: Attack increase from 90 to 100
Krookodile: Defense increase from 70 to 80
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