This made by  Natsukis_Commishes that  mitchell45 got for me this is a Anthro but i do plan to have have a normal sneasel body once i give him some updates to his look

Sergio past - Sergio was once a Normal Sneasel who once live in Mt. Silver how ever his life change when he saw a ho-oh come falling down into the snow he rush to where it landed and saw it was badly hurt and dieing he did his best to try to save it but the ho-oh moved by his act of the ho-oh set his wing on him and set it self on fire how ever he not being harm by the fire but feel something powerfull it end up knocking him out when he come too he saw the ho-oh was no where in sight but saw that his body have change now with rainbow markings all over his body and his feathers tails and ear have change to all so be rainbow much like ho-oh as time when on he start to find out things about this change he not ageing if he is he ageing slowly as he out live many Sneasel and most pokemon around him he even work out that he can use moves like Sacred Fire. At 500 years of age he want to find out more about his change so he head to kingdom of Pangororia he hear that pokemon like Ho-oh and lugia are well love there and he work out he likely to find out what he needs to know form that kingdom form is time liveing there he learn more about ho-ohs even hear there one liveing there but yet to meet that ho-oh.

the present - Now a 1000 years old and still looks like he not age a day he lives happily in the kingdoms he even hopes to one day get a join for one of the royal Familys as with how long he live he feel he can be usefull with all he knows he all so come to Learn that the ho-oh he help that day use some kind of power to bond with him and now both his and the ho-oh souls are one he is trying to find ways that can let him talk to the soul of the ho-oh he all so come to love diapers form liveing in the kingdoms and on Pangororia most pokemon seem to like him as they think he honoring ther fenyx he don't not mind that way of thinking and still hopes to meet her he all ways gos around helping any one in need as he feels that with his power he can help others