Maybe a easy (1 player + 1 Chocobo), normal (2 player + 2 Chocobo) and hard mode (4 player + 4 Chocobo) special dungeon where Chocobo can earn EXP at a special rate and players getting special vanity gears, crafting materials, Chocobo bardings and on rare occasions, key item to be used for Chocobo breeding that will in turn resulting into different stats for Companion Summon or Chocobo Racing. That will really spice up the Companion system, since it's pretty much useless now due to multiple restriction and the fact that it's pretty much useful only when solo leveling alts.