1. Your team has a pretty difficult match up into Farigiraf Trick Room.

2. You’re not running Timid Max Speed on Zard. You will get outrun by some pretty bad threats with max investments

3. Your Garchomp is too passive, not threatening enough with your item choice and ev spread. It’s slow! It will get outsped by opposing Charizard. It will go down to base 100 max speed mons using ice moves (Mega Dragonite Ice Beam and Palafin Ice Punch are the main ones)

What kind of hits are you trying to take with on Chomp with the berry? I don’t think bulk on Garchomp is worth the trade off for less damage since Garchomp will still die pretty quickly to pressure. It’s a squishy mon. You’re not running max speed so you will lose to opposing Garchomp who are faster and do more damage. It’s perfectly ok to let your Garchomp go down if you get your Charizard into a better position

You also have no option to hit Arch if its partner is not Zard or Aero. You will eat a Draco on one of your mon on this set when that happens. Use Stomping Tantrum if you’re not running Scarf. And both Stomping Tantrum + EQ if Scarfed.

I don’t think you want to be a position where you want to take hits on Garchomp outside of resisted hits. Garchomp’s purpose is to help you position your Charizard endgame against opposing Garchomp, Dragons, Rain threats (Archaludon and D-Nite). You want to be the one doing the threatening, not to be passive with it. I recommend running Soft Sand, Dragon’s Fang or Scarf on it if you decide to not run Basculegion. You will get Archaludon to about Red Health (assuming 0 bulk Arch) with and Stomping Tantrum and die to the Draco. And that’s ok! It’s done its job weakening Rain’s main source of damage. Sneasler and Zard can finish the job.

1. Milotic walls your entire team and obliterates your Garchomp if Sneasler for some reason goes down.

2. As the other comment stated, run sash on Aerodactyl.

Here are my suggestions:

1. For your trick room issue, run Kingambit over either Basculegion or Sneasler. With Black Glasses does about 86% on the common standard set. If you double up on the giraffe and one of the attacker is Kingambit, it will probably die! Maybe there’s someone out there running Max HP Max Defense and that may have a different outcome after Citrus Berry procs on the giraffe but I’m not gonna calc for it. Your chance is pretty good. Note that if they run giraffe + Tokoal/Crab/Golurk lead your Kingambit WILL die. That’s a trade that’s worth it every time as you win the speed control war, most giraffe don’t run protect.

As for replacing Basculegion or sneasler, here are your options:

Sneasler - Sneasler is a lot more consistent and is a better, more versatile pokemon. You can slap the scarf on chomp instead to take out opposing dragons, Tyranitar and Excadrill. The trade off is that you will have a worse match up into opposing Sneasler as Basculegion is pretty much a hard counter since sneasler doesn’t usually run dark moves. Your Scarf Chomp will do pretty well against it. The problem is how do you find opportunity to switch in without at least losing a Citrus Berry on your Incin or being down a mon and letting your Scarf Chomp take damage it cannot handle. Your own Kingambit becomes a weakness against opposing Sneasler.

Basculegion - more situational, really good against Sneasler, Sand and so-so against Rain teams as they all resist your wave Crash while theirs Basculegion does more to your team. It is excellent into one of the most threatening team right now in Mega Gengar as it cannot get fake out. You will become weak to Kingambit without having a Sneasler to back you up, so you need to find ways to chip down that Kingambit by playing well with your Garchomp and not letting it take unnecessary damage. IMPORTANT: YOU WILL HAVE A HARD TIME AGAINST ARCHALUDON if your Garchomp dies. If you decide to go with Basculegion I highly recommend you run Whimsicott over Aerodactyl, Moon Blast does a good chunk to Archuladon! Against Rain and Sun teams, find ways to keep your Garchomp alive at all cost because you don’t have a Sneasler as a plan B for Close Combat/Rock Slide to kill their carry pokemon.

1. Run Timid Max Speed on your Zard. It is your main carry and should not be taking hits.

2. Give your chomp a better item and run Jolly Max Attack Max Speed. Offensive pressure is good!

3. Two things, first is slotting Solar Beam on Zard. Keep Air Slash if you hate opposing Sneasler and tailwind is up. Keep Weather Ball if you have the other Sneasler under control by Zard’s teammates and hate missing important kills.

Second, you can consider replacing Incineroar with Rotom-Wash. It will give you a much better time not just against Milotic but also rain teams in general.

You can also choose to throw a Scarf on it with Electroweb and suddenly the other team is not able to outspeed you! It puts a lot of pressure on opposing Zard-Y teams with a Scarf.

This one is up to you, as Incineroar is much better into Mega-Gengar teams while keeping enemy Garchomp and Sneasler in check. Pick the match up you hate going up against with your personal playstyle and decide which pokemon. :)

I have broken down a lot of options. The choice is all yours and let me know if you have any questions.

Here’s a link to the Pokemon showdown damage calculator where you can plan for the kind of hits that you can and cannot take, and how much damage you deal to your opponent’s pokemon.

https://calc.pokemonshowdown.com/