OK, For the ability to put the dino in your map in whatever biome you want on any map, write this into your game.ini. (Not GAMEUSERSETTINGS).

ConfigAddNPCSpawnEntriesContainer=(NPCSpawnEntriesContainerClassString=SE_DinoSpawnEntriesCanyons_C",NPCSpawnEntries=((AnEntryName="GigantSpawner",EntryWeight=0.2,NPCsToSpawnStrings=("Gigant_Character_BP_Mod_C"))),NPCSpawnLimits=((NPCClassString="Gigant_Character_BP_Mod_C", MaxPercentageOfDesiredNumToAllow=0.2)))

If you want to replace the beast altogether and just have this giga running around your Ark , do this also in your game.ini (NOT GAMEUSERSETTINGS).

[/script/shootergame.shootergamemode]
NPCReplacements = (FromClassName = "Gigant_Character_BP_C", ToClassName = "Gigant_Character_BP_Mod_C")