Short answer: the invite limit and the group size are two different numbers on purpose. Pokémon GO raised Weekly Challenge invites from 3 to 10 so you have a buffer against people who decline or never respond, but the group that actually earns rewards together still caps at 4 Trainers - the first 4 to accept fill it, and any later acceptances don't bump anyone out or create a second group.
Trainer school
Why can you invite 10 friends to a Pokémon GO Weekly Challenge if the group only holds 4?
Weekly Challenges are capped at a 4-Trainer group, same as when they launched - what changed is only how many people you're allowed to ask.
What actually changed
Per Pokémon GO Hub's coverage of the update, the invite limit went from 3 friends to up to 10 friends per Weekly Challenge, rolled out worldwide. The team size stayed at 4 players - that number hasn't moved since Weekly Challenges launched. The extra invite slots exist to solve a real annoyance: with only 3 invites and a 4-person group (yourself plus 3), a single friend who ignores the invite or is already in another group left you stuck without a full team. Inviting up to 10 gives you a much better chance that at least 3 of them say yes.
How the overflow is actually handled
- The first 4 Trainers to join - by invite or by matchmaking - make up the group. Everyone after that simply doesn't get a seat; it's not a queue or a waitlist.
- If your group is still short of 4 when invites run out, the game offers random matchmaking with strangers to fill the remaining slots - see our matchmaking guide for exactly how that works and what it does to friendship points.
- You can keep sending new invites from the Progress page for as long as the group has an open slot, so "10 invites" isn't a one-time batch you're stuck with - it's the maximum you can have pending or used at once.
Why not just raise the group size instead?
Niantic didn't say why directly, but the shared research task, the per-groupmate friendship-point payout, and the Lucky Friend chance are all designed around a 4-person group - see how those points and chances work. Raising the invite cap fixes the "friends ignore invites" problem without touching the reward math or making the weekly task easier to finish with a bigger crowd.
FAQ
Does inviting more than 4 people make the group's task easier or faster? No - the shared progress target doesn't change with group size, and only 4 Trainers can ever be in the group at once.
What happens to the 6th, 7th, etc. invite if 4 people already accepted? Nothing - those invites simply don't seat anyone. The group is already full once 4 Trainers have joined.
Can I remove an accepted member to let someone else in? This isn't documented; if your group fills with people you didn't want, your fastest fix is waiting for next week's reset rather than trying to force a swap mid-week.
Does this invite-limit change affect the reward for finishing a Weekly Challenge? No - see what a completed Weekly Challenge actually pays out and what happens if a groupmate drops out mid-week.
I don't have 10 people to invite - can I still fill a group? Yes - opt into random matchmaking instead, or grab a fresh trainer code or browse codes by country to build up a friend list you can invite from next time.