The Pain Split set is akin to the Disable set, but the approach to this set is much more offensive. Pain Split acts like a third attacking move capable of muscling through typical counters with massive HP stats such as Blissey, Chansey, and Snorlax. Furthermore, Pain Split works perfectly in conjunction with Substitute and Life Orb, and even benefits from the residual damage from sandstorm and hail. The closer Gengar's health bar gets to zero, the more HP Gengar can suck away from its opponents. Gengar's coverage is impressive, and it can act as a fail-safe sweeper at any given time even with the absence of an extra coverage move.
The combination of Substitute and Pain Split allows Gengar to take out Pokemon it normally would not be able to, most notably Blissey. After Substitute and two Pain Splits (or one if sandstorm is in effect), Blissey's health will be low enough that Focus Blast 2HKOes. This means that Blissey will be forced to constantly heal herself or risk being KOed. Pain Split has 32 PP, while Wish and Softboiled have 16, meaning that Gengar can easily stall Blissey out. Finally, most Blissey are unable to break Gengar's Substitutes, meaning Gengar can usually come out of the duel unscathed.
Toxic Spikes is the most beneficial form of entry hazard to use with this set in order to hasten the damaging process against the likes of Blissey. Forretress makes an excellent supporter who can provide all types of hazards, especially Toxic Spikes. Ferrothorn makes a great partner, able to open up opportunities for Gengar to switch in, in addition to providing entry hazards. Heatran should also be considered as an offensive partner due to its ability to draw in more opportunities for Gengar to switch in. Gengar has such atrocious defenses that it's actually quite difficult to pull off strategies like this, so always consider Pokemon that draw in Normal- and Ground-type attacks for Gengar to switch in on.
With such a direct approach to this set, Gengar is highly capable of beating many special walls with some good timing. As a result, it is recommended that Gengar is paired with sweepers who would normally have a difficult time bypassing said walls. Life Orb Latios, Volcarona, and Choice Specs Politoed make fine offensive partners who are all capable of sweeping after these special walls are eliminated.
However, Gengar wouldn't be able to KO that quickly, something that I see as important. Even though you've said why Gengar wouldn't be troubled by it, having a Fighting-type attack - and a Pokèmon that can use it well - is going to help anyway.
Never meant to cause a sort of mini-arguement xD So can anybody suggest some pokemon for my team or should I just use whatever I can get my hands on :S
I think I'm going to play offensive. And I'm more of a casual battler as I've just started to do it.
If so, then may i suggest Hyper offense, in which you put a team of Duel screens + 3 to 4 sweepers + a couple of supporters.
Basically your strategy is to set up dual screens i.e Reflect and Light Screen with a Pokemon like Espeon and then pack powerful sweepers like Haxorus or support mons like Jirachi or even baton passers. If you are interested in HO, you might like reading this article. Obviously you might have to change your team completely, but in my opinion Hyper Offense is one of the easiest to use strategy.
Once, you determine you core, that is the Pokemon which are the base of your team, we can give more specific advises for your team.
What Pokemon should I use with thise? And What Items should I put on? Can you Rate this here?
Crunch (might replace with energy ball.)
Dragon Rush (Replace with Draco Meteor.)
Ability: Magic Guard
Ability: Flame Body
Item: None (might give white herb or air balloon