These cards are hard to find and are only distributed through some of the largest and most competitive events in the world, so getting your hands on these will require some serious skills or reassessing your financial status
These are the cards available in Pokemon TCG Pockets Mythical Island set along with their pull rates: The early screenshots released for Mythical Island also reveal new Expert Solo Battles, including against a Mew ex & Mewtwo ex deck, an Aerodactyl ex and Marowak ex deck, and a Blue & Pidgeot ex deck
A pretty dubious card to just jam randomly, I could imagine Aetherflux Reservoir as either a sideboard option against red or as a quasi-storm combo kill card
By having no low HP Pokmon, DTE Mew is also more dangerous to Lost Zone decks: since theres no Meloetta to KO, they cant count on a 1-2-3 Prize map
Preferably, they have anti-botting measures or invite systems
You can also make money by selling premium items that give players an advantage in the game