To spawn a Maeguana in Ark Survival Ascended, you need to open up the command line and type the following cheat codes:

Tame Maeguana Spawn Command

cheat gmsummon "Maelizard_Character_BP_C" 150

The last number above will be the wild level it will spawn in at, and then it will get the full tame effectiveness and be a tame 225 Maeguana. 

Wild Maeguana Spawn Command

cheat SpawnDino "Blueprint'/Game/ASA/Dinos/Maelizard/Maelizard_Character_BP.Maelizard_Character_BP'" 500 0 0 150

The code above is all on one line and there is a space before the "Blueprint... For the above wild Maeguana spawn code, the last number (150) will be the number will be the level of the maewing-thing. The other three numbers from left to right are the distance the Maeguana will spawn from you on the x, y and z axis. 

Maeguana Saddle Spawn

admincheat gfi eliz 1 10 0

With this command the first number (1) is the quantity of saddles to be spawned in and the second number (10) is the saddle quality.  Saddles will appear in your inventory.