I got something to add though I'm 2 months late. I realized how this many things happened in this only episode that never happened elsewhere.
1. Brock not going to crazy over Nurse Joy. The REAL ONE!!! (I might be wrong)
2. Pikachu only time battling Raichu.
3. Surge remains the tallest, only American in this episode.
4. Surge is the only one who swears and says it in English.
5. Team Rocket cheering for Ash.
6. Only time Ash and Pikachu encounters the Thunderstone.
7. Believe or not, to me Lt. Surge was like a villian in this episode since Team Rocket was on Ash's side.
8. Also, Surge is the only gym leader who lost his cool and control. (Meaning here how he orders Raichu to destroy the gym. Temper, Temper. Wonder how he would of done in MTV's show Boiling Point?)
9. Somehow, Raichu and Surge actually got Pikachu convinced to battle.
10. Pikachu disobeys Ash during the first battle.
Well that's all I could come up with. It just makes this episode more amazing. I have few more things add to my response.
Lt. Surge is one of my favorite all time gym leaders. I grew to like him. He has a nice body to add. What I like most of him is his personality. He was funny and mean which made this episode the cream of the crop, plus Raichu. Raichu is my all time favorite Pokemon. Because of Raichu got me liking this episode.
Rating: 10/10, one of best episode I eva seen!