A few corrections:
Frisk is Sentret’s Hidden Ability, meaning it is not possible to change its ability to Frisk using an Ability Capsule.
On the subject of Frisk, I don’t believe the game gives you a message if the opposing wild Pokemon has Frisk so it may be worth noting that just because no message appears, doesn’t mean that the Sentret in question doesn’t have Frisk.
Friend Safari Pokemon do not hold items, so farming Luvdisc there is a waste of time.
2 additional easy to obtain Heart Scales can be obtained in Suntouched City by showing a girl southwest of the statue of Jaern a Jigglypuff.
It may also be worth noting that a second Lucky Egg can be obtained from a Whismur in Hekate Town.