I did solo a level 10 gym once early October when I was lv26, because I want to hentam one my fren (dragonite cp2950) that sit second top of the gym in this place called MAEPS.

My attackers were nothing but pathetic dragonite cp25xx, vaporeon cp22xx, dragonite cp21xx, lapras 20xx, iv100% golduck cp18xx, flareon cp18xx.

If not remember wrongly, min. cp of the Pokemon there started with 22xx, mix of 1 arcanine, 2 exeggutors and the rest were snorlax n dragonites (I hate snorlax!!).

I swear it would be the last time to solo a max level gym. 😂 It took me ard 1.5 hours, burnt a total of 76 hyper potions, 20 max potions and 88 revives.

After took it down, I put a pidgey there. Haha! And kesian the pidgey couldn't even survived more than 1mins, they (team instincts) reclaimed the gym. Lol.

And I wan to call fellow valorians, if have time then we shall group together to raid the gyms over there - Malaysia Agro Exposition Park Serdang (MAEPS) which near the place that held the led flower event. There were total 4-5 gyms, usually conquered by team instincts. Cannot let them everyday claim the coin so comfortably! Haha!

I won't solo a level 10 gym either cause it's just a waste of resources. But seems like you've been battling inefficiently. Try not to get your Pokemons KO-ed, switch when their HP is red instead . So that you don't need to use revive. Just heal them back up after each battle.