Mega Golisopod Details

Bulk Up raises Attack and Defense, then leverages its high bulk to keep up the pressure — a physical attacker build.Leech Life lets it heal HP while fighting, so it can stay on the field for a long time and wear down the opponent.

Alternative Move Options

Swords Dance is also an option for the Bulk Up slot

It can strengthen both Attack and Defense at once with Bulk Up, but if you want to raise Attack all at once, Swords Danceis also recommended. You lose the Defense boost, but the increased power means Leech Life's recovery amount increases, and Sucker Punch widens the range of Pokémon it can lock down.

Securing a hit against Steel-types is also recommended

the STAB move Iron Head can be swapped out, using instead a hit against Steel-types like Drill Run or Close Combat is also recommended.

First Impression is also an option instead of Sucker Punch

The priority move Sucker Punch's slot has the restriction of only being usable on the turn it enters the field, but it can be swapped for a powerful STAB move like First Impression is also recommended.

Role of the Bulk Up Leech Life Build

On favorable matchups, Bulk Up to raise its Attack and Defense, then use Leech Lifeto keep its HP up while fighting. Its Ability Tough Claws triggers on contact moves, so it fights mainly with those, and uses its priority move Sucker Punch to make up for its lacking Speed while it controls the field.

Threats

Special Fire-type Pokémon that exploit its 4x weakness

Mega Golisopod is 4x weak to Fire-type moves, and has no way to raise its Sp. Def, so it's easily knocked out by special Fire-type moves — a difficult matchup. Common threats like Mega Charizard Y and Mega Delphox fire off high-power Fire-type moves from the top, so avoid facing them directly.

the priority move First Impression as its main weapon, this is an attacker-cum-pivot Golisopod that also aims for matchup control.Endure or Life Orb recoil damage to deliberately activate its Ability Emergency Exit is triggered, and manipulating unfavorable matchups and forcing powerful priority moves upon re-entry — its composition.

Alternative Move Options

Razor Shell is also recommended

Liquidation slot, Razor Shell is also recommended. Compared to Aqua Cutter, Razor Shell is weaker in power, but has a higher chance of lowering Defense.If the Defense drop lands, it also supports follow-up physical attackers, so customize it to suit your team.

Endure Pivot/Cushion Role

• Chip away while controlling matchups with its ability
• Sweep with First Impression upon re-entry

Life Orb-boosted First Impression to chip the foe in a direct matchup, then uses its Ability Emergency Exit to switch out and bring in a teammate safely. When it returns to the field, it can again pressure the foe with First Impression is forced upon them, and locking the opponent down from above regardless of their Speed while running a favorable cycle — its role.

Favorable Matchups

Pokémon whose weaknesses can be exploited with First Impression

Golisopod First Impression is strong against Pokémon whose weaknesses it can exploit. Since First Impression has a high priority of +2, as long as Golisopod has any HP left, it can deal a fatal blow.

Threats

Bulky setup-move users

This build of Golisopod does not run a setup move, so breaking through bulky Pokémon takes time.If the opponent uses a setup move without attacking Golisopod, the ability Emergency Exit cannot trigger either, so switch out as soon as possible.

Leveraging its high bulk and Attack, it shines as an ace under Trick Room — a physical attacker build. Its Ability Tough Claws boosts the power of contact moves, giving it excellent performance both offensively and defensively.

Alternative Move Options

First Impression or Rock Slide are also good options

First Impression can only be used on the turn it's sent out, but in exchange it's a high-power priority move. Also, Rock Slide it half-resists both Bug- and Rock-type moves in return, but this lets you exploit Mega Charizard Y's 4x weakness.

Doubles Trick Room Attacker Role

an ally's Trick RoomAfter it's set up, it comes onto the field, and Leech Life chips away at the opponent while recovering HP as its basic gameplan. It also has Sucker Punch, a priority move that works regardless of Speed, so it can keep pressuring opponents even after Trick Room ends.

Threats

Fire-type Pokémon

Fire-type Pokémon exploit its 4x weakness and also resist both Bug- and Steel-type moves. Against Pokémon it struggles with, block their moves with Protect while countering with your ally's moves. Also, against Mega Charizard Y, Mega Golisopod's Rock Slide to go for its 4x weakness.