Why this matters

A core is useful when its members create turns for each other. It is not only a list of resistances.

A practical approach

Use this as a focused testing loop. The goal is to make one part of your decision process clearer before adding more complexity.

• Write down what the core beats and what forces it out.
• Add partners that improve bad board states, not only type coverage.
• Test at least one lead that does not include the core's main attacker.

Example to test

If Garchomp pressures damage while Rotom-Wash covers awkward board states, the next slot should solve a positioning problem rather than add another attacker.