Let's see Pikachu's Status in Sinnoh: [Counting Gym/Rival/Frontier Battles]
#1. Ash VS Paul 1: Pikachu VS Elekid- Tied. +0
#2. Ash VS Roark 1: Pikachu VS Cranidos- None. +0
#3. Pikachu VS Onix- Lost. -1
#4. Ash VS Roark 2: Pikachu VS Onix- Wins. +1
#5. Pikachu VS Rampardos- Loses. +0
#6 . Ash VS Reggie- Pikachu VS Staraptor- Wins. +2(You can count this one if you want)
#7. Ash VS Crasher Wake- Pikachu VS Gyarados- Wins. +3.
#8. Pikachu VS Floatzel- None. +3
#9 Ash VS Fantina(Unnofficia)- Pikachu VS Drifloon/Drifblim. Loses. -2.
#9. Ash VS Barry 1- Pikachu VS Empoleon- Wins. +4
#10. Ash VS Fantina- Pikachu VS Drifblim- Loses. -3.
#11. Ash VS Paul Full Battle- Pikachu VS Ursaring- Loses. -4
That's currently Pikachu's Stats:
Wins: 4
Losses: 4
Ties: 1
Hopefully in Sunyshore Gym or most likely the League. Pikachu did Star in 4 Hoenn Gyms and 3 Kanto Battle Frontier Facilities, so yeah, its time to let it take a break and let Ash's newer Pokemon shine.
BTW, if you are going to talk about the League, use this Thread:
The New Sinnoh League/Elite 4 2010- Thread