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Mr. Toxicroak, if you're going to contribute you might want to read ALL of the thread. And just so you know, hydrogen and sodium wouldn't react and therefore even more chemicals would be needed to produce water and salt.

Maybe Asphasm? (Asphyxant+Phasmid)

Quick recap including a proposed Phiasma Dex.

Name: Mimicket (MIMic + crICKET)
Class: Mimic Tail Pokemon
Ht: 2'4"
Wt: 73 lbs.
Type: Bug
Dex:
It has a flower-like tail which is used to lure prey while it hides the rest of its body underground.
Mimicket is fairly common in flowery fields which is the most favorable place to blend in.
SpecAb: Adaptability
EvoInfo:
Evolves into Carablast at lvl. 30 (if red)
Evolves into Phiasma at lvl. 30 (if purple)
Moves:
--Tail Whip
--Tackle
5-Leech Life
10-Sand-Attack
13-Bug Bite
17-Sweet Scent
20-Dig
23-Mimic
26-Protect
30-Power Tail
33-Tail Glow

Name: Carablast (CARABidae [Bombardier Beetles] + BLAST)
Class: Cannon Tail Pokemon
Ht: 3'9"
Wt: 97 lbs.
Type: Bug/Fire
Dex:
It mixes the two highly volatile chemicals in its tail to produce explosive fires all around.
The by-products of its mixed chemicals are salt and water, which it uses to survive in the desert.
SpecAb: Flash Fire/Shell Armour
EvoInfo: Evolves from Mimicket at lvl. 30 (if red)
Movelist:
--Tail Whip
--Tackle
--Leech Life
--Sand-Attack
--Bug Bite
--Sweet Scent
24-Dig
27-Mimic
30-Flamethrower
35-Protect
37-Power Tail
42-Tail Glow
46-Kindle
50-Fire Blast
55-X-Scissor
59-Fire Bomb

Name: Phiasma (PHasmid [Stick Insect] + mIASMA)
Class: Noxious Tail Pokmon
Ht: 3'6"
Wt: 115 lbs.
Type: Bug/Poison
Dex:
It lives in isolated areas that are shrouded in mysterious fog. It only comes out to hunt at night.
During the day it sleeps in a dense shroud of gases and fumes that never stop seeping from its tail.
SpecAb: Stench/Shell Armor
EvoInfo: Evolves from Mimicket at lvl 30 (if purple)
Movelist:
--Tail Whip
--Tackle
--Leech Life
--Sand-Attack
--Bug Bite
--Sweet Scent
24-Dig
27-Mimic
30-Poison Jab
35-Protect
37-Power Tail
42-Tail Glow
46-Gastro Acid
50-Gunk Shot
55-X-Scissor
59-Poison Mix

I also gave Carablast Shell Armour, which I think all of Mimicket's evos should have in common.

Noxious Tail doesn't exactly roll of the tongue, maybe Smog Tail?