the marauders fandom seriously needs to realise that peter pettigrew was the fourth marauder, not regulus black. He was their closest and trusted friend. That's why he was the secret keeper. That's why his betrayal hurt.
He was not some stupid tag-along side kick, he was just as capable as the rest of his friends.
He did more than transforming into an animagus and helping in the creation of the marauders map.
He performed the Blasting Curse in 1981, blowing up a street and simultaneously killing twelve muggles. He was then able to flawlessly frame sirius for these murders.
Peter produced the Rudimentary body potion and the regeneration potion per Voldemort's instructions, allowing his master to regain a temporary, and then permanent, form, respectively. He also helped brew the Polyjuice Potion for Barty Jr to disguise as Moody.
Pettigrew could perform conjuration, an advanced type of Transfiguration. In 1996 he conjured ropes which bound Harry Potter to Tom Riddle Snr's grave.
Peter was able to perform magic non-verbally. During his escape, he non-verbally Stunned both Ron and Crookshanks before fleeing.
Peter's deductive skills were considerably high, as he deduced his master's first defeat after seeing the destruction of the house and the sight of the fallen wand, and was able to find Lord Voldemort's hidden location, something other more talented Death Eaters who made the effort to do, had failed.
He was a lying, conniving traitor. But he was not dumb or stupid.
