There arent really any cards that reduce the mana costs of triggered abilities out there
Change your other monsters to ATK Position, Use Loading
As far as strategy goes I would consider using this card in my deck just to move one energy card from the active Pokemon, I would really like to use this when you know your opponent doesn't have any energy cards in their hand and they need another one to attack you, if you move Smoochum in and use Energy Antics and remove an energy card from that active Pokemon it will be a long time before that Pokemon will be able to attack again
Company: Pokemon USA Series: Sun & Moon Team Up Item Type: Single Card Brand: Pokemon Release Date: February 1, 2019 UPC: Stock #: 286104 Our Guarantees to You, Our Valued Customer
While Legion's Landing could theoretically find a home in Modern eventually, it hasn't really caught on yet, and History of Benalia, while devastatingly powerful in Standard, is pretty slow for non-rotating formats