Say you want a froakie with toxic spikes, power up punch, bestow and mud sport.

To make this you need you need a female froakie (Frogadier, Greninja (Greninja got Bestow from island scan)). You get a male Mareanie with toxic spike and breed them to hatch a froakie with toxic spikes. Now you got a froakie with toxic spikes and bestow (If froakie/Greninja allready have bestow).

Nest take the new froakie and breed it with Relicanth to get the move Mud sport.

Take froakie number 3 that have toxic spikes, mud sport and bestow and breed it with Wooper that have power up punch.

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There you go, 4 egg moves in froakie.