Question

What are the encounter multipliers for each Encounter Sandwich Boost?

Answer 1

Encounter Sandwiches attempt to force a spawn of their given type.

Level 1: 50%
Level 2: 75%
Level 3: 100%

Sandwich (Bulbapedia)

Comments

Is this a multiplier or a +boost?

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As dataminer Anubis says: "Encounter Power causes [a] spawner to only select Pokémon of a matching type if any are possible."
https://twitter.com/Sibuna_Switch/status/1639063140334723095