Training

Training - Here is full list of trainers with their training rewards and requisites:

Trainer - (condition) training reward - requisite - Console Command code

The Commercium[]

Zenon - Persuasion/Streetwise/Trading/Etiquette Skill +15SP - MG member - rwd_training(Zenon);
Linos - Persuasion/Streetwise/Trading/Etiquette Skill +15SP - Complete MG3, no gold stolen path.
Cado - Impersonate/Streetwise/Persuasion Skill +15SP if you bought the armor - MG2, signed contract - rwd_training(Cado);
Maseus - Etiquette/Persuasion Skill +20SP - MG member - rwd_training(Maseus);
Strabos - Streetwise/Trading Skill +20SP - Complete MG5, CHA 8+ - rwd_training(Strabos);
Athanasius - Lore/Persuasion Skill +20SP - Before MG7, prepare to do some miracles - rwd_training(Athanasius);

Neleos - Streetwise Skill +1 - Do not kill the spies in AG1.
Agatai (in Neleos' dialogue) - (CS 1-3) CS Skill +15SP, (CS 4-5) Combat SP +15, All Combat Skills Training +1, (CS 6+) CS Training +10 - Complete AG1, must not have full HP - rwd_training(Agatai);
Coltan - Alchemy Skill +1 - Alchemy Skill = 1 - rwd_training(Coltan);
Fulvio - Ranged Training +10 - AG member - rwd_training(Fulvio);
Cyrus - Impersonate/Streetwise/Persuasion Skill +20SP - AG member - rwd_training(Cyrus);
Hamza - (CS 1-3) CS Skill +15SP, (CS 4-6) Combat SP +20, All Combat Skills Training +1, (CS 7) CS Training +10 - Complete AG4, AG reputation 10+ - rwd_training(Hamza);
Varro - (CS 1-4) CS Skill +20SP, (CS 5-7) Combat SP +20, All Combat Skills Training +1, (CS 8+) CS Training +10 - Before AG7, join him - rwd_training(Varro);

Cado - Lockpick Skill +10SP - Complete Vignette (Thief), show him the ring and the gems.
Aziz - Melee Training +10 - TG member - rwd_training(Aziz);
Livia - Impersonate/Streetwise/Persuasion Skill +15SP - Send her to Cado (PER 8+ or Streetwise 3+ or Steal 3+) - rwd_training(Livia);
Lucius - (CS 1-3) CS Skill +15SP, (CS 4-5) Combat SP +15, All Combat Skills Training +1, (CS 6+) CS Training +10 - TG3, CHA 6+ - rwd_training(Lucius);
Cyrus - Impersonate/Streetwise/Persuasion Skill +20SP - TG6 - rwd_training(Cyrus);
Thief (TG7) - Traps/Lockpick Skill +20SP - TG7 - rwd_training(TG7);

Centurion - Defense Training +5 - Complete IG2 by bold attack(needs Statistics and/or Reputation check, then right dialog option. See The Wind Sweeping Through Towers) - rwd_training(IG2_01);
Centurion - Melee Training +5 - Complete IG2 by proposing attack plan(similar as above) - rwd_training(IG2_02);
Carrinas - Melee Training +10, Defense Training +10 - Complete IG3 by killing Antidas - rwd_training(IG3_01);
Carrinas - Melee Training +5, Defense Training +5, Persuasion/Streetwise/Trading/Etiquette Skill +20SP - Complete IG3 by persuading Antidas - rwd_training(IG3_02)
Carrinas - Melee Training +10, Defense Training +10, +15SP - Complete IG3 by making Antidas an Emperor, defect for IG in MG2 - rwd_training(IG3_03);
Vitus - Crafting Skill +15SP - IG4, before leaving for the pass - rwd_training(Vitus);
Centurion (Trainer Melee) - Melee Training +5 - Caer-Tor, any melee skill 7+ - rwd_training(CT_Melee);
Centurion (Trainer Ranged) - Ranged Training +10 - Caer-Tor, any ranged skill 7+ - rwd_training(CT_Ranged);
Centurion (Trainer Defense) - Defense Training +5 - Caer-Tor, any defense skill 7+ - rwd_training(CT_Defense);

Cassius - Lore/Crafting/Etiquette Skill +15SP - Take him to Antidas, HD reputation 10+ if threatened or taken him to the hovel - rwd_training(Cassius);
Feng - Streetwise/Trading/Persuasion Skill +15SP - Being on good terms with him, not conned, after buying Galbo's Ring (item) from him, CHA 7+ or being his apprentice - rwd_training(Feng);
Dellar - Sword Training +5, Dodge Training +5, CS Training +5 - CHA 7+ or CHA 6+ and being a Praetor - rwd_training(Dellar);
Kemnebi - Block Training +5, Trading/Streetwise Skill +15SP - He must survive the battle with 100 swords and return to Maadoran - rwd_training(Kemnebi);
Erebus - Lore/Persuasion/Etiquette Skill +20SP - Being able to meet him, HA reputation 10+ - rwd_training(Erebus);
Antidas - Lore Skill +10 - CHA 7+ or Praetor - rwd_training(Antidas);
Antidas - Dagger Training +5 - Complete praetor vignette by killing Zenon (INT 7+, Streetwise 2+).
Tiresias - Lore/Etiquette/Streetwise Skill +15SP - Pay him 500GP or 250GP (CHA 7+, Streetwise 7+).
Esbenus - Dodge Training +5, Max HP -2 - Fail an attempt to kill him by CS (CS 3-).

Feng's Boxes - Lockpick Skill +10SP - Expel Feng from Teron or DEX 8+, PER 8+, Lockpick 3+, Sneak 4+.
Feng's Scroll - Lore Skill +10SP - Expel Feng from Teron or DEX 8+, Lockpick 3+, Sneak 3+.
Teron Blacksmith's Workbench - Crafting Skill +10SP - DEX 6+, Sneak 3+
Teron Palace Tractate - (Etiquette 1) Etiquette Skill +1, (Etiquette 2+) Civil SP +5 - STR+DEX 16+ or STR+DEX 12+ and Throwing 3+; CS+Sneak 6+.

Structure and content largely taken from Sunfire's page on GOG.