plz don't use Hardy. Even if you want to be original, there isn't a list of good natures for each pokemon. I'm serious.
Swampert-Brave/Relaxed/Quiet
Miltank-Impish/Adamant
Raichu-Hasty/Lonely
Blaziken-Adamant/Jolly/Hasty/Rash/Naive/Naughty/Mild
Dragonite-Lonely/Adamant/Naughty
Mewtwo-Modest/Timid
If you hate Smogon stuff...then consider these movesets I created myself (they are probably aren't as good, but they work)
Swampert @ Leftovers
Brave nature
EVs: 240 HP / 136 Def / 56 SAtk / 76 SDef
-Earthquake
-Hidden Power [Bug]
-Ice Beam
-Counter/Mirror Coat
This set is kinda fun. Get Celebi to around 60% health, then finish it with HP Bug (keep it till that is complete, or else the surprise is gone)
Swampert @ Choice Band
Brave nature
EVs: 240HP/ 252Atk/ 16SAtk
-Earthquake
-Hidden Pwer [Bug]
-Rock Slide
-Hydro Pump
This can catch its counters off guard
Mewtwo @ Leftovers
Mild nature
EVs: 84 Atk / 220 Spd / 200 SAtk (not sure)
-Snatch
-Ice Beam
-Shadow Ball
-Recover
Snatch CMs/Swords Dances and you are set
Mewtwo @ Choice Band
Lonely nature
EVs: 252 atk/220 Spd/40Sp.def
-Shadow Ball
-Earthquake
-Ice Beam
-Thunder/Thunderbolt
Miltank @ Choice Band
Adamant nature
EVs: 252 Atk/ 252 Spd/ 6 Def
-Return
-Shadow Ball
-Earthquake
-Focus Punch (I'm not sure if he can learn this)
Ok, so that's all I can think of now
Read the "annoyers fail" sticky
Well, Neutral nature sucks because you don't take advantage of your pokemon's abilities
Water Pulse only has a 20 (or is it 30)% chance of confusing, so its not reliable
Also my last Question to you is:
Why do you think Smogon has movesets posted up there if it wasn't for use?