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A lot of balance and care goes into choosing the cost of a card, more than I can express here, but looking for similar effects on existing Magic cards can give you an idea of a fair costfor example, a ramp spell that puts two lands into play ought to cost 4 mana, per Explosive Vegetation

Up to fifteen cards may be included in your sideboard, if you use one

So far, Grass-type decks in Pokmon TCG Pocket don't have a true energy accelerator in the ways that other decks like Charizard ex or Starmie ex have

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Check with your local WPN game store to see what they have in store for Game Day!