itemless dhelmise supports the team as it can come in on the polterspammers which are locked into their choice-items and can just spam its own
poltergeist or hit them with a strong power whip, dhelmise furthermore removes entry hazards like stealth rocks and spikes from the field, and has
synthesis to keep itself alive.
espeon has choice specs with magic bounce to bounce back any status- and hazard move but has the aspect of hitting hard with psychic, dazzling gleam, and shadow ball. furthermore it has access to trick which cripples incoming switchins such as bronzong and copperajah.
swords dance toxicroak is the breaker on this team with its dual-stab in drain punch and gunk shot, it can hit a lot of pokemon at least for neutral damage with that stab combination and also has knock off to remove annoying items from the opposing side, such as heavy-duty boots and leftovers to dismantle their longevity and to limit the turns to come in on the field.
in overall: this core can work with the help of dhelmise switching into polterspammers, espeon as some kind of speed control and toxicroak as a breaker and they can support each other pretty well in this aspect.