Disclaimer: No, I do not own Pokémon. If I did, the animé would have a plot.

This could be about Ash and Pikachu, or it could be about another trainer and his/her Pokémon. First and third are the trainer's POV, second is the Pokémon's, fourth is both's.

Pokémon, Pokémon, live up to your name.
Imagine being in the Hall of Fame
with a Pokémon master's skill and pride;
your trusted partners by your side…
For many years I chased that dream,
but I'm only happy while we are a team.

Pokémon, Pokémon, united we stand,
bound with friendship, paw to hand.
I used to hate you, but now you're my friend;
there are no scars that time doesn't mend.
We're different species, but I don't care;
there are so many other things that we share.

Pokémon, Pokémon, listen to your heart;
I should have done so right at the start.
What use is a title and worthless fame
if you don't have a friend who would like you all the same?
Our bonds have grown from a tiny seed,
now you're all I'll ever need.

Pokémon, Pokémon, differences aside;
from a real friend you have nothing to hide.
Come closer to my face and look me in the eyes,
we're bound with the universe's strongest ties.
Life would just not be the same without you;
together forever, our friendship is true.