Mr.E Jorgen
Fuck it, let's casebash this shit. This is strictly a spinning contest; I know half of them have other utility but we're ignoring that for now. I'm also assuming that teams won't have more than one of [Gengar, Misdreavus, Tyranitar, Umbreon], and that Cloyster always has Toxic. Tell me if I get something wrong.
Opponent has Cloyster only:
Cloyster: "Tie", depending on set. Umbreon support helps.
Donphan/Golem: Spikes stay down basically forever.
Forretress: Can remove Spikes in the short term with Giga Drain (somewhat prediction-reliant) but they otherwise stay down; can win and remove them in the long term with Toxic or with Umbreon support.
Starmie: Spikes are gone in the short term; they will end up down for periods in the long term.
Tentacruel: No Spikes, ever.
Opponent has Cloyster + Gengar:
Cloyster: Spikes usually stay down forever.
Donphan/Golem: Spikes stay down basically forever.
Forretress: May be able to remove Spikes in the short term with Giga Drain+Hidden Power Ghost (prediction-reliant) but they otherwise stay down; to win in the long term it needs either Toxic+Hidden Power Ghost, Toxic+Tyranitar support, or Umbreon support.
Starmie: Spikes may or may not stay down in the short term (prediction-reliant); in the long run it usually reduces to Starmie vs. Cloyster.
Tentacruel: Spikes stay down in the short term; removes them in the long term with Tyranitar or Umbreon support.
Opponent has Cloyster + Misdreavus:
Cloyster: Spikes usually stay down forever.
Donphan/Golem: Spikes stay down basically forever.
Forretress: Spikes stay down in the short term; can win and remove them in the long term with Toxic or with Hidden Power Ghost+Umbreon support.
Starmie: Spikes stay down in the short term; to win in the long term it needs Toxic or Tyranitar support.
Tentacruel: Spikes stay down in the short term; removes them in the long term with Toxic or Tyranitar support.
Opponent has Cloyster + Umbreon:
Cloyster: Your opponent will probably win in the long term, but in the short term it's still a "tie" based on moveset.
Starmie: Spikes are still gone in the short term, but in the long term you're more likely to have to accept them due to the extra pressure on Starmie.
(no other spinner cares about Umbreon)
Opponent has Forretress only:
Cloyster: Spikes are gone in the short term unless Forry has Giga Drain; in the long term they'll probably end up down if Forry has Toxic.
Donphan/Golem: Spikes are gone in the short term; in the long term they'll probably end up down if Forry has Toxic.
Forretress: Stalemate, unless one of you has Hidden Power Fire or Curse. I guess you can stall them out of Spikes???
Starmie: Spikes stay down basically forever if Forry has Hidden Power Bug. Otherwise they're gone in the short term, but will end up down for periods in the long term if Forry has Toxic.
Tentacruel: No Spikes, ever.
Opponent has Forretress + Gengar:
Cloyster: Spikes stay down in the short term; in the long term you can only remove them if you have Pursuit support and Forry doesn't have Toxic.
Donphan/Golem: Spikes are gone in the short term; in the long term they'll probably end up down if Forry has Toxic.
Forretress: Spikes stay down forever unless you have Hidden Power Ghost or some form of Pursuit support, and then it's still a stalemate.
Starmie: Spikes stay down forever if Forry has Hidden Power Bug. Otherwise they may or may not stay down in the short term (prediction-reliant) but will be gone in the long term unless Forry has Toxic.
Tentacruel: Spikes stay down in the short term; removes them in the long term with Tyranitar or Umbreon support.
Opponent has Forretress + Misdreavus:
Cloyster: Spikes stay down in the short term; in the long term they'll stay down only if Forry has Toxic.
Donphan/Golem: Spikes are gone in the short term; in the long term they'll probably end up down if Forry has Toxic.
Forretress: Spikes stay down forever unless you have Toxic, Hidden Power Ghost or Tyranitar support, and then it's still a stalemate.
Starmie: Spikes stay down forever if Forry has Hidden Power Bug. Otherwise they still stay down in the short term but may be removed in the long term with Toxic or Tyranitar support.
Tentacruel: Spikes stay down in the short term; removes them in the long term with Toxic or Tyranitar support.
Opponent has Forretress + Umbreon:
Cloyster: Spikes are gone in the short term; in the long term they'll stay down.
Starmie: Spikes are still gone in the short term, but in the long term you're more likely to have to accept them due to the extra pressure on Starmie.
(no other spinner cares about Umbreon)
Opponent has Spiker + Tyranitar:
(Tyranitar can't Pursuit any of the spinners except the mythical Surfless Starmie)