basicaly you do the same as in Pokemon emerald and all the rest. first lv him up to lv. 20 than,(but first have let nincada be the leader, have nobody else be on your team if you do put them on stanby) once you do that go to the wiscash pond and evolve you become ninjask than you look whos on your team right at the moment and there should be a shedinja there.
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Nincada evolves into Ninjask at level 20 while Nincada evolves into Shedinja when you level it up while you have space in your party and your belt.
Nincada evolves into Ninjask at level 20. If you have an empty slot in your party and an extra pokeball (a normal pokeball) Nincada will also evolve into Shedinja (It evolves into two Pokemon at once)
Level 20. Have at least one pokeball in your bag and at least one open space in your party to get Shedinja when you evolve Nincada into Ninjask.
nincada evolves at level 20 in Ruby/Sapphire it also evolves into shedinja so you better leave space in your team
To get the other form of Nincada (which is Shedinja) you need 5 spaces in your party including Nincada and at least one Pokeball. Then you need to get Nincada to level 20. It will then evolve into a Shedinja. In the space that was empty, you also get a Ninjask.AnswerFirst you must catch a Nincada at any level under 20. Then while you are training you must keep at least one space left with no Pokemon in your party, and you must also have a Pokeball or any kind of Pokeball. Finally, train your Nincada to level 20 which is when it evolves into a Ninjask. The empty space you left blank would then be a Shedinja inside one of your remaining Pokeballs in the bag.