I have put way too much thought into this but as a result I have a team that meets all requirements and even has a good chance of beating some of the "entire spiritomb WG Teams" so here it goes
Single or dual
1. Spiritomb
Ability: wonder guard
Nature: Adamant
Item: Ghostium Z
Moves: perish song, ominous wind, shadow force, hyperspace fury (all 255pp)
2. Luxray
Ability: wonder guard
Nature: adamant
Item: air balloon
Moves: precipice blades, diamond storm, ominous wind, blizzard (all 255pp)
3. Shuckle
Ability: arena trap
Nature: lax
Item: leftovers
Moves: baneful bunker, slack off, aromatherapy, conversion 2 (all 255pp)
4. Blissy
Ability: shadow tag
Nature: lax
Item: leftovers
Moves: spiky shield, slack off, aromatherapy, conversion 2 (all 255pp)
5. Jolteon
Ability: wonder guard
Nature: adamant
Item: air balloon
Moves: eruption, muddy water, discharge, dazzling gleam (all 255pp)
6. Raikou
Ability: wonder guard
Nature: adamant
Item: air balloon
Moves: thousand arrows, sludge wave, focus punch, toxic (all 255pp)