If you have a full party, you may cast a spell with mana value 4 or less from your hand without paying its mana cost
What decks are you playing in Standard right now
The most common way is the suspend mechanic, like on Search for Tomorrow or Sol Talisman, which lets you exile a card from your hand, put some time counters on it, and then cast the card for free when those counters are gone
2x Aerodactyl ex 2x Old Amber 2x Mankey 2x Primeape 1x Marshadow 1x Hitmonlee 2x Poke Ball 2x Professors Research 2x Sabrina 2x Potion 2x X Speed Aerodactyl ex is also a fantastic counter to decks that rely on Stage 2 Pokemon as their primary attackers, such as Blastoise ex, Venusaur ex, and Charizard ex decks, given that it's Primeval Law ability does not allow opposing active Pokemon to be evolved
Crystal Pokmon are a unique Pokmon variant that were introduced with the Aquapolis set
4: Lukka deals X damage divided as you choose among any number of target creatures and/or planeswalkers, where X is the greatest power among creatures you controlled as you activated this ability