The 8th Gym Leader

Okay, before I go ham in what my feedback is, I gotta ask. Is this Gym Leader meant to be like any regular old Final Gym Leader? Or are you making some kind of extreme difficulty where this Gym Leader exists?

 

I see. Though even with that I think that this Gym Would be an absolute nightmare to beat.

3 Pseudo Legendaries isn't something you normally see in Gym Leaders, even if its for the 8th. Those things are on the same level as legendaries. That power level is usually reserved for Champions or Post Game battles. Lance has 3 Dragonites and he's a champion. Not to mention the Mega Legendary in the squad. Mega Rayquazza is more powerful than Arceus. That power is insane and personally, I think that's straight-up overkill on the player. Its like he has 4 legendary Pokémon and two really strong additional Pokémon to boot.

Not to mention the level caps. I did some research and almost every single game caps you at least 20 levels above the final gym leader before getting their badge. I get why you would make it lower since you want a challenge, but I think keeping at 60 when the Champion has his at 65 is nuts.

(Side note, Level 60 is a long way. I assume the rest of the journey would make you naturally progress to that level. The champion usually has their teams somewhere in the mid to late 40's )

Basically, if you're trying to make a battle/game that's meant to make your players cry you've succeeded in it. If you're trying to make a game that's like the rest of the main series and is supposed to be fair then this guy needs some heavy nerfs.

 

I mean... if you want to create this game for uber competitive players who have the time and resources to create the right counters, I guess you can market it for that niche? But it would basically be nigh impossible for everyone else - and far too frustrating, as Nyxie said, so I don't think it'd be successful outside the exact uber competitive people.
To me a huge appeal of Pokémon is the idea of partnering with the mons and building a team that the player is attached to for sentimental or power reasons, and as you said it can be cleared with a bunch of fairies - aka just "have the right counter" kinda removes the whole appeal on that. It's like a lot of complaints people had about Sticker Star in the Paper Mario series, when the bosses boiled down to "have the right attack (in this case Pokémon) to win and you die if you don't" instead of the earlier games where a big fight is just a special fight, which really limits creativity and freedom in the gameplay and punishes the player for being wrong. Yeah the Gyms are usually given their types to make them easier to counter, but rarely is it the case that most of the team needs to be overhauled just to get through, resulting in more grinding that needs to be done. Like, there's a difference between "rewarding" challenging and "punishing" challenging, and the team falls rather close to the latter.
But I guess what you're making is a kaizo game (aka a game that is unfairly hard) with less "slap six Rayquazas on a team boosh badda bing the end", in which case it probably works?
Sorry if this is kinda rude but Nyxie absolutely had a point, if you're makin a kaizo game be prepared to only have the kaizo market and not much else.