the old way that you are referring to is:
1. catch a pokemon in the wild and check its ivs (if you dont have an AR, then you have to catch lv. 50+)
2. plug in its ivs or stats into seed finder on RNG reporter, and hit generate
3. it will give you a second and delay. hit Okay at the bottom
4. on the main page, it should have a seed for you, and you should be on dppt egg pid (either international or normal). uncheck the shiny only box
5. hit generate. a list of natures will pop up.
6. find an option with the correct nature/gender/ability, and right click it.
7. select calculate poketech taps.
8. do as many taps as it says and then switch to the coin flip ap and do as many flips as it says.
9. go to the daycare and put you parents in
10. wait until an egg is available. save before you obtain it and check to see if its shiny
so you should save 1 poketech ap infront of the happiness checker ap. and in some grass where you can catch a lv. 50+ wild pokemon, with a sweet scenter