[B-Zard]

So it looks like you have problems with bulky waters like Swampert, Vappy (Gyara sort of) and Scizor. Only thing I can say is maybe using Shaymin > Gengar since Shaymin handles bulky waters like Swampy and Vappy pretty damn good and still is able to do something against Bliss and Snorlax with Leech Seed (whereas your Gengar had Pain Split). Hp Fire kills Scizor and most don't expect you to have Hp Fire lol. Shaymin isn't as fast as Gengar, and replacing it with Gengar removes your splin blocker, but Shaymin also has a few advantages since it is much bulkier than Gengar, it can serve as a status absorber and can help your team with Leech Seed. Gengar did have Substitute but since Shaymin has Natural Cure, you don't really need Sub to block status moves. Here's the set that I would recommend to you:

Shaymin set

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Shaymin @ Leftovers
Ability: Natural Cure
EVs: 4 hp/ 252 spatt/ 252 speed
Timid Nature (+Speed,-Att)
- Seed Flare
- Earth Power
- HP Fire
- Leech Seed

This is an offensive Shaymin set and would be a good replacement for Gengar. Seed Flare hits Vappy really hard and is your best attack against things like Snorlax and Gyarados. A combination of Earth Power, Seed Flare and SR damage kills Vappy. Hp Fire obviously is for Scizor, Forry and Skarmory since most don't expect it on a Shaymin set, thinking you're defensive. Earth Power kills Tran and with the amount of speed you outspeed them, although you should be careful of Scarfed sets since they outspeed you, but luckily Dragonite and Suicune can check what set they have since they can take most attacks Heatran throws at them. Hp Fire makes your speed IV 30, so you have 327 speed, meaning you don't speed tie with things like max speed Zapdos and Jirachi, but the pros of carrying Hp Fire are more valuable in my opinion. Leech Seed is for Bliss to regain an insane amount of Hp every turn; in combination with lefties you regain more than Bliss does with Seismic Toss lol. Leech Seed also is your best answer to Snorlax, although you should be careful not letting it set up Curse; this is where Taunt Ttar can help. You can also Leech Seed Vappy since Vappy also has an insane amount of Hp and the only thing they can do is Toxic which nullifies after you switch out. So the thing you can do is Leech Seed Vappy, then switch into Suicune to CM up. Since you have Leech Seed + Lefties you regain a nice amount of health every turn, while Hp Electric doesn't do that much; it only does20%~ to Suicune at +1 and with Lefties + Leech Seed you regain 23%~ per turn lol, so you recover more than he does with Hp Electric. With Swampert the same, try to Leech Seed first since most will switch out anyways, so you can get the Leech Seed on the switch + some SR damage. Shaymin also is capable of getting a late game sweep like your Gengar, has more reliable moves (no shitty 70% accuracy) and has Seed Flare to lower Spdef 2 stages lol.