Granted that the information is basic and can be found in the Psydex, it is a handy guide for training.
EXP + EV guides for all of them would be nice, RSE -> BW, as well as HGSS gym battle rematches, for RED.
I'll update. I don't think that anything before RSE is much to write about - just EXP. Ironic - that may be the only thing not found in the dex.
Ruby / Sapphire
Code:
Sidney
Mightyena Atk +2
Shiftry Atk +3
Cacturne Atk +1, SAtk +1
Sharpedo Atk +2
Absol Atk +2
Total if killed by one Pokemon: Atk +10, SAtk +1
Phoebe
Dusclops x2 Def +1, SDef +2
Banette x2 Atk +2
Sableye Atk +1, Def +1
Total if killed by one Pokemon: Atk +5, Def +3, SDef +4
Glacia
Glalie x2 HP +2
Sealeo x2 HP +2
Walrein HP +3
Total if killed by one Pokemon: HP +11
Drake
Shelgon Def +2
Salamence Atk +3
Altaria SDef +2
Flygon x2 Atk +1, Speed +2
Total if killed by one Pokemon: Atk +5, Def +2, SDef +2, Speed +4
Steven
Skarmory Def +2
Aggron Def +3
Claydol SDef +2
Cradily SDef +2
Armaldo Atk +2
Metagross Def +3
Total if killed by one Pokemon: Atk +2, Def +8, SDef +4
Total for Elite 4 if killed by one Pokemon:
HP +11, Atk +22, Def +13, SAtk +1, SDef +10, Speed +4
Fire Red / Leaf Green (Elite 4 Rematch)
Code:
Lorelei
Dewgong
Cloyster
Piloswine
Jynx
Lapras
Bruno
Steelix x2
Hitmonchan
Hitmonlee
Machamp
Agatha
Gengar x2
Crobat
Misdreavus
Arbok
Lance
Gyarados
Kingdra
Dragonite x2
Aerodactyl
Rival
Heracross Atk +2
Alakazam SAtk +3
Tyranitar Atk +3
Total EVs guaranteed for every player
Plus, depending on your starter:
Charizard SAtk +3
Blastoise SDef +3
Venusaur SAtk +2, SDef +1
Exeggutor SAtk +2
Gyarados Atk +2
Arcanine Atk +2
Emerald Elite 4 Rematch (Gym Leaders change every time, and not unlimited from what I can find. All Gym matches Double battles)
Diamond / Pearl
Platinum
HG/SS
Gym Rematches:
Elite 4 Rematch
Black and White (Someone else do this, I haven't quite picked this up...at all)