As long as you're not completely unprepared, Falkner and his roost shenanigans shouldn't be a problem. And Geodude will mess him up. I guess my first tip would be...watch out for the ambush rival fight in Azalea town. He casually shows up if you enter the general area left of the (2nd) gym. Also, be aware that Rattata can be quite strong. It's fast and gets some solid moves, and has a 50% chance of having the ability Guts, which makes it kind of a sweeper if you play your cards right.
As long as you're not completely unprepared, Falkner and his roost shenanigans shouldn't be a problem. And Geodude will mess him up. I guess my first tip would be...watch out for the ambush rival fight in Azalea town. He casually shows up if you enter the general area left of the (2nd) gym.
Also, be aware that Rattata can be quite strong. It's fast and gets some solid moves, and has a 50% chance of having the ability Guts, which makes it kind of a sweeper if you play your cards right.