Mahamuti Quest
Like Alien Quest, it does not matter which of your dinoz completes each action, you can use any and all of them. You will save a lot of irmas by have one dino at Grandpa's and another dino at the Mutant Falls fulfilling those parts of the dialog. Note that you can do this quest while performing other quests as well.
Before the beginning, you need a dinoz that has:
Skully Souvenir
Blacksylva Key, but NOT necessarily that this dino visited the magnetic steppes- finished the Grandpa Joe's Mission
Grandpa Joe
Grandpa Joe's Home (Dinoland)
Speak with Grandpa Joe
Use 
the Shovel at the Lodestone Pylons (Magnetic Steepes)
the Shovel at the Lodestone Pylons (Magnetic Steepes)You will obtain an old photo of Grandpa Joe.
Speak with Grandpa Joe
Go to Sticky Swamp
Tired Man
Sticky Swamp (Atlantean Islands)
Speak with Tired Man
Go to Dinoplaza
Wine Seller
Dinoplaza (Dinoplaza)
Speak with Wine Seller
You will obtain a bottle of the big reserve of wine of Dinotown.
Go to Mutants Falls
Tired Man
Mutants Falls (Atlantean Islands)
Speak with Tired Man
He will tell you that his name is Al Zaimeur.
Go to Ashpouk Ruins
Merguez Seller
Ashpouk Ruins (Lavapit)
Speak with Merguez Seller
You will obtain a burned mergez.
Go to Mutant Falls
Al Zaimeur
Mutants Falls (Atlantean Islands)
Speak with Al Zaimeur
Go to Frish Port
Joveboze
Frish Port (Dinoland)
Speak with Joveboze
You will obtain a Salzheimon.
Go to Lavapit
Use the Shovel to found Salt
the Shovel to found SaltYou will obtain a Lava Salt.
Go to Sticky Swamp
Al Zaimeur
Sticky Swamp (Atlantean Islands)
Speak with Al Zeimer
Go to the University
Profesor Eugene
University (Dinoland)
Speak with Eugene
Go to Grandpa Joe's Home
Grandpa Joe
Grandpa Joe's Home (Dinoland)
Speak with Grandpa Joe
Wait 2 hours and speak with Grandpa Joe again
Go to the Twilight Cementery
Skully
Twilight Cemetery (Dinoland)
Speak with Skully with a dinoz with the Skully Souvenir
the Skully SouvenirGo to Mutant Falls
Al Zaimeur
Mutants Falls (Atlantean Islands)
Speak with Al Zaimeur
Go to Grandpa Joe's Home
Grandpa Joe
Grandpa Joe's Home (Dinoland)
Speak with Grandpa Joe
Go to Sticky Swamp
Al Zaimeur
Sticky Swamp (Atlantean Islands)
Speak with Al Zaimeur
Fight against the Rapacarapace (with a group of dinoz, if all the group has action and the leader send fight, all group fight)
Can be poisoned.
Can be killed by trio of lvl 35 dinoz.
XP poor (9xp for 3x45 lvl)
Can be killed by trio of lvl 35 dinoz.
XP poor (9xp for 3x45 lvl)
Go to Grandpa Joe
Then you had to finish Al Zeimer Mission before he proposes you a new quest.
Reward: 
6 Tac Tickets that will give you 1 in 6 chance of having the Mahamuti.