That's what Scald is for, dude. Try to fish for a burn with it, or you can always switch out. If you're bugged that Gastrodon's not working for you, Ferrothorn can be used instead:
-Spikes/Stealth Rock
-Leech Seed
-Power Whip
-Gyro Ball/Thunder Wave/Protect
Nature: Relaxed
EVs: 252 HP/88 Def/168 SDef
Item: Leftovers/Shed Shell
You forgot that Gengar has Levitate, didn't you? It can switch in to the Ground and Fighting moves aimed at your team, then set up a Sub to predict the next switch-in. When its HP gets too low, that's when you use Pain Split.
And you forgot that Reuniclus has 110 base HP, right? It compensates for its 75 Defense and 85 Special Defense (the latter defensive stat is rather decent). The EV spread I mentioned optimizes its bulk. Also, if the lack of recovery bothers you, use this:
-Calm Mind
-Psyshock
-Focus Blast
-Recover
Nature: Bold
EVs: 252 HP/252 Def/4 SDef
Item: Leftovers/Life Orb
Ability: Magic Guard
The reason I wanted to include a Water type was because having access to Ice Beam, Earthquake and Scald in one moveset gives coverage in Ground, Grass, Fight, Steel, all threats to Sand teams, and add into that Swampert's bulky stats.
If it is for Ferrothorn, can I add Scizor instead of it, or do the two have different functions in this team (lol rethoric question).
Haha I totally forgot about Gengar. Now you're right, I see what I can do with it.
I was so so so thrilled, keen and excited about using Machamp, it's perfectly accurate Dynamic Punch seems so delicious to me :(... Is there any way we can make a spot for this little guy?
And last, can you please, suggest me how to "use" the pokemon in the double battles I will be playing? I mean, which Pokemon should be played with which, which one would help the other more?
THank you!