I believe Peter was there that night in Godric's Hollow. I believe he was the one to recover the wand after the Potter's house blew up. I also believe Peter is the one that gave Voldemort's wand back to him.
Peter went into hiding for 12 years in his animagus form of a rat. Peter chose to stay in his rat form.
An Animagus is a wizard or witch capable of turning into a particular animal and back at will. While in animal form, the witch or wizard have the abilities of the animal they have transformed into,
while retaining the mentality of a human.
I don't believe Peter was
unable to change into a man he just didn't want to. I don't think Peter regretted the fact that he betrayed the Potters or framed Sirius for the murder of 12 muggles and sent him to Azkaban for 12 years. Peter sold out two of his best friends without a thought because he thought he would be handsomly rewarded by Voldie. If he regretted his actions, I believe his magical ability could have been effected like Tonks was... but he only cares for his own well being.
Remenber the prophecy from PoA made by Trelawny??
Quote:
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The Dark Lord lies alone and friendless, abandoned by his followers. His servant has been chained these twelve years. Tonight, before midnight ... the Servant will break free and set out to rejoin his Master. The Dark Lord will rise again with his servant's aid, greater and more terrible that ever he was. Tonight ... before midnight ... the servant will set out to rejoin his Master...
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After Wormtail was forced out of hiding he went out in search of Voldemort. While seeking his master, he kidnapped Bertha Jorkins, from whom Voldemort learned of Barty Crouch Jr. Using Wormtail's help, Voldemort created a rudimentary body, corporeal enough to perform magic with.
Another curious question is how did Wormtail come to be Percy's pet rat???