Actually, there is. To verify and advance your seed, there is a spinning pointer at the bottom of the screen. By noting the starting position of this pointer, you can easily tell if you hit your seed or not There are 8 possible positions the spinner can be in so if you match only a few you can be pretty confident you hit your seed. From there you just advance to your frame and keep verifying.
Also, and this is something I recommend doing, you can RNG a random pokemon from the DR before you RNG your target. Say you want to RNG the Lugia, you could first RNG a Riolu using the same spread. If you get the right spread for Riolu, just do the exact same thing for Lugia.
The process may seem complicated at first, but it is really easy once you get the hang of it. The hardest part is the math, and that is simple addition and subtraction, so as long as you can handle first grade math, you can count, and you don't rush into it and get careless, there is virtually no room for error.
Also be sure to not that the Genies have a separate generation method. They are considered a slot 2 pokemon so the starting IV frame is different and you need to add 5 to the starting PID frame as well. Again though, just RNG a slot two pokemon (have at least 2 pokemon ready to transfer and try to RNG the second one instead of the first one) to verify your spread is right and everything will be fine.
Is Multiscales Lugia, Regenerator Ho-oh and the Genies worth it? Well that is a matter of opinion I guess, but I RNGed two sets of them myself (had to delete the app and my B2 save just to get them at lvl 5 too) and they are pretty cool IMO. As an added bonus, DR abuse is WAAAAAAAAY easier than entree forest abuse.
Since this is coming up and since RNGR still hasn't added support in yet, this
guide might be a great help to those wishing to RNG the DR but don't have a Mac. I used that guide to learn DR abuse and I found it easy and straightforward. All credit for that guide goes to RNGer Aaron of Smogon who wrote it in its entirety after figuring out the process himself from Chiizu's research notes and trial and error. Hew is also my new found hero!