As long as your opponent isnt playing with an insanely powerful or convoluted deck that can hit hard on the first turn, your Riolu should be able to hold on until you can get Lucario into play it has a reasonable 70 HP, which can withstand many early game attacks, along with a Punch (costing 1 Fighting Energy to use) that deals 10 HP of damage
The second (and more dangerous) way you can be disrupted is if your resources run too low, and your hand and deck combined have 6 or fewer cards in them, causing you to deck out
The group was tentatively called Studio X
Some playgroups might allow it, some might not
Due to providing constant value, cards with doubling, or even tripling, effects are always in high demand
So again, definitely include a Landorus EX Pokemon card in a deck that partially includes fighting type Pokemon