Phantump Weakness in Pokémon GO: Ghost/Grass Catch Mastery Guide

Phantump Catch Mastery is scheduled for September 26, 2026, from 10:00 a.m. to 8:00 p.m. local time. Pokémon GO says Phantump will appear through Field Research plus free and paid Timed Research. Phantump is Ghost/Grass, so it does not behave like a pure Ghost or Grass defender. Read the official announcement.

This guide separates confirmed event details from the standard type-chart answer. It does not assume an unannounced raid, moveset, or battle role.

Official event facts vs. type-chart planning

Officially confirmed: Pokémon GO lists Phantump in Field Research, free Timed Research, and paid Timed Research during Catch Mastery. It also says all Timed Research tasks and rewards must be completed and claimed by 8:00 p.m. local time on September 26.

TypeMatchup’s chart interpretation: the official Pokédex identifies Phantump as Ghost/Grass and lists Fire, Flying, Ice, Ghost, and Dark as weaknesses. In the standard Pokémon type chart, each of those attacking types is super effective against Phantump. See Phantump’s official Pokédex entry. Pokémon GO has its own effectiveness values, live move availability, and battle formats, so this is a transparent type baseline—not a permanent counter ranking.

Phantump weakness chart

This visual reference applies standard type interactions to a Ghost/Grass defender.

Attacking type	Standard result against Phantump	Why it matters
Fire	2× super effective	Fire hits the Grass half super effectively.
Flying	2× super effective	Flying provides direct Grass pressure.
Ice	2× super effective	Ice is another direct Grass weakness to test.
Ghost	2× super effective	Ghost is super effective against the Ghost half.
Dark	2× super effective	Dark is super effective against Ghost.
Normal or Fighting	0× in the standard chart	Ghost grants an immunity to both attacking types.
Water or Electric	½× effective	Grass resists each of these attack types.

For the full interaction set, start with the Ghost type matchup page and Grass type matchup page. Then use the home-page type matchup calculator to enter Ghost and Grass as the defending types. The type effectiveness calculator is useful when you want to add an individual move type and check the standard multiplier alongside STAB.

Five weaknesses, not one automatic answer

The chart gives Phantump five 2× weaknesses, but that does not make Fire, Flying, Ice, Ghost, and Dark interchangeable. Dark is worth checking early when survivability matters because it pressures Ghost while having a favorable standard-chart relationship with Ghost damage. Ghost can provide the same super-effective result but may be exposed to return Ghost pressure. Fire, Flying, and Ice are equally valid chart answers through the Grass half; their value turns on the particular Pokémon’s moves, level, and defensive profile.

That is why this guide does not name one permanent “best” counter. In Pokémon GO, live moves, stats, weather, shields, raid rules, and your roster decide whether a chart-correct option is actually practical.

A simple event-to-battle workflow

Catch Mastery is an encounter and research event, so protect the time window first and keep the Ghost/Grass chart for future formats.

1. Check the event date and plan to play before the local 8:00 p.m. research deadline.
2. Complete and claim Field Research and Timed Research rewards before the event ends; unclaimed Timed Research rewards expire.
3. If you need a standard matchup answer later, test Fire, Flying, Ice, Ghost, and Dark before neutral options.
4. Rule out Normal and Fighting as type-only damage answers, since Ghost creates an immunity in the standard chart.
5. Confirm live moves and format before spending resources.

For a broader group, use the team weakness calculator to spot repeated standard-chart weaknesses.

Keep the claims narrow

The event announcement does not announce a Phantump raid boss, moveset, damage breakpoint, required team, or best counter. Use this standard-chart reference as a starting point, then verify the in-game details for your encounter.

Phantump Catch Mastery FAQ

When is Phantump Catch Mastery in Pokémon GO?

Pokémon GO schedules the event for September 26, 2026, from 10:00 a.m. to 8:00 p.m. local time. Phantump appears in Field Research, free Timed Research, and paid Timed Research.

What is Phantump weak to?

Phantump is Ghost/Grass. Under the standard type chart, Fire, Flying, Ice, Ghost, and Dark are super effective against it.

Is Normal or Fighting good against Phantump?

No. In the standard chart, Phantump’s Ghost type makes Normal- and Fighting-type attacks have no effect.

Does the event announcement confirm the best battle counter?

No. It confirms encounter and research details. Live moves, stats, shields, and battle rules determine a practical Pokémon GO counter choice.