If you catch a Pokémon does your chances of meeting it in the wild increase?
Solution 1:
Not normally, however, when you have a Pokemon with the ability Static in the lead, your chances of encountering electric type Pokemon increases to 150%.
If Pikachu's encounter rate is for example is 10%, it becomes 15%.
If your Pikachu isn't in the lead when you saw the other Pikachu, then you were just lucky :)