ash will get a raichu!ever because later when the show finishes professor oak will retire and ash will need a stronger Pokemon that a dumb pikachu so he gets a thunderstone and evoles it to raichu. Trust me,in my state the show is already over
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Pikachu will evolve into Raichu when given a thunder stone. If you mean Ash's Pikachu, then it very unlikely he will evolve his Pikachu, as Pikachu is the Pokemon Franchise's mascot.
Ash's Pikachu will not evolve because Pikachu chose to stay with Ash and gain more experience and in the episode that Ash had battled Lt. Surge Nurse Joy gave Ash a Thunderstone but pikachu don't want to evolve and Brock said that pikachu has more speed than Raichu
Back in Indigo Plateau (1st season), Pikachu declined a chance to use a Thunderstone. When Gym Leader Lt. Surge was teasing Ash of being a "baby," Ash's Pikachu attacked Surge's Raichu, but Raichu knocked Pikachu out. Brock suggested that Ash use a Thunderstone that Nurse Joy offered, but Pikachu decided to grow stronger on his own without a Thunderstone, then Ash got the idea of teaching Pikachu Agility. Therefore, Pikachu may never evolve. This makes sense, since there was another Trainer who rivaled Ash in Hoenn and had a Meowth with the same story: it lost to a Persian once and then hated all Persians since then.
Raichu does not evolve. Raichu is the combination of Pickachu and a thunder stone, and he does not evolve.
Raichu is the last form of pikachu and its preevolution is pichu.