Hi! Here's my set. It isn't optimal, but I guess it works!
Zigzagoon @ Oran Berry
Trait: Pickup
Level: 5
EVs: 212 HP / 196 Atk / 28 Def / 28 SDef
Adamant Nature
- Belly Drum
- ExtremeSpeed
- Seed Bomb
- Protect

With no speed EV, it reaches 12 speed, which is nice to outspeed things like frillish and hippopotas and OHKO them with seed bomb. Most other EVs are put in HP. The only problem? Oran Berry isn't gonna fully heal.
protect is here as it's better to stop fake out from mienfoo, which is OHKOed by extremespeed as well as timburr. Substitute doesn't really have any use and it's slow as fuck to use return and the only other option is lolrocksmash.

252SpAtk lvl 5 Abra (Neutral) Psychic vs 212HP/28SpDef lvl 5 Zigzagoon (Neutral): 78% - 95% (18 - 22 HP). Guaranteed 2HKO.
252SpAtk lvl 5 Abra (Neutral) Hidden Power (Fighting) vs 212HP/28SpDef lvl 5 Zigzagoon (Neutral): 86% - 104% (20 - 24 HP). Guaranteed 2HKO. 25% chance to OHKO. Can't guarantee the non-KO here, but most of the time it won't KO.
252SpAtk lvl 5 Staryu (Neutral) Hydro Pump vs 212HP/28SpDef lvl 5 Zigzagoon (Neutral): 78% - 95% (18 - 22 HP). Guaranteed 2HKO.
252SpAtk lvl 5 Snover (Neutral) Blizzard vs 212HP/28SpDef lvl 5 Zigzagoon (Neutral): 78% - 95% (18 - 22 HP). Guaranteed 2HKO. This guy is a bit problematic though as if it gets the high damage roll, hail damage is gonna KO.

The only real problem with that Ziggy set is that oran berry doesn't fully heal. I tried other various EVs, but most of them doesn't have the staying power this ziggy has... Blame the lack of eviolite.

Hi. I'm curious of your Zigzagoon spread, can you send it to me. That looks legitimately interesting with good team support, because the issue I've always had with Zigzagoon was it wasnt bulky enough to set up.