Why does that Kingler have Sheer Force with no moves boosted by SF on a team that is partially walled by Tangela? Kingler + Leafeon is a cool core for weakening fat Grass-types for each other, but I think it works better if one of them is carrying X-Scissor or Ice Beam. Jumpluff, like Raw already said, is a big threat, and Kingler needs SR down in order to OHKO Jumpluff with Return (whereas Ice Beam does about 20% more with SF and LO), so there are a few reasons to use Ice Beam over Return here.
Looking at this team, it needs a Scarfer for some immediate Speed, and it's lacking an Electric immunity. At the same time though, not many Scarfers fit here naturally without adding problems for type synergy or multiple weaknesses to the same Pokemon. For example, Rotom-F is usable, but it adds a third Fighting weakness, which then makes things like AoA Monferno do too much here. Mr. Mime would be cool to heal up Ursaring, but we have Grumpig already. This Pokemon also needs to be faster than Jolly/Naive Ninjask (460 Spe) or have some priority that can beat it, as we have nothing so far that's stopping it from spamming U-Turn except a Relicanth, which can be scared out by whatever Ninjask is switching into. So:
Raichu @ Choice Scarf
Ability: Lightning Rod
EVs: 252 SpA / 4 SpD / 252 Spe
Modest Nature / Timid Nature
IVs: 0 Atk / 30 Def
- Hidden Power [Ice]
- Focus Blast
- Thunderbolt
- Volt Switch
Raichu fits all of these criteria while also having SE coverage for every Scarfer outside of Mr. Mime. You can use Timid if you're scared of stuff like Sand Stoutland, Unburden Drifblim, Scarf Dodrio / Floatzel / Simipour, but Modest outspeeds Scarf Sawsbuck and can 2HKO Mr. Mime with Thunderbolt (the boost in power is noticeable). It also provides some momentum and therefore, opportunities to setup with SD or Agility for Leafeon / Kingler. If you predict Stunfisk or Roselia coming in, it's easy enough to Volt Switch out to Grumpig to scare out Roselia, or double to Kingler / Leafeon to scare out Stunfisk. As you Volt Switch to Ursaring, it also activates Toxic Orb on that turn, which is a nice side-effect.