Why did Pikachu not evolve?

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Tags

1. #pikachu
2. #evolve
3. #thunder
4. #first
5. #chose
6. #choice
7. #wanted
8. #stronger
9. #because
10. #stone
11. #could
12. #evolving
13. #without
14. #prove
15. #makes
16. #defeat
17. #after
18. #surge
19. #raichu
20. #choose