how would you gain the abilities? By walking on a certain block or getting a certain item or something?

 

Not tested but the skunity parser didn't return any errors.

Spoiler: Code

Code (Text):

1. options:
2.     byakuganTimer: 1 minute
3.     sharinganTimer: 1 minute
4.  
5. on drop of blaze rods:
6.     if name of event-item is "Byakugan" or "Sharingan":
7.         cancel event
8.  
9. on rightclick with blaze rods:
10.     if name of event-item is "Byakugan":
11.         remove event-item from player's inventory
12.         apply potion of swiftness of tier 2 to player for {@byakuganTimer}
13.         apply potion of strength of tier 1 to player for {@byakuganTimer}
14.         apply potion of glowing of tier 1 to player for {@byakuganTimer}
15.     if name of event-item is "Sharingan":
16.         remove event-item from player's inventory
17.         loop all players:
18.             if loop-player is not player:
19.                 apply potion of swiftness of tier 2 to loop-player for {@sharinganTimer}
20.                 apply potion of jump boost of tier 2 to loop-player for {@sharinganTimer}
21.                 apply potion of strength of tier 1 to loop-player for {@sharinganTimer}
22.                 apply potion of glowing of tier 1 to loop-player for {@sharinganTimer}
23.  
24. command /dojutsu <text> <player>:
25.     permission: op
26.     usage: "/dojutsu (byakugan/sharingan) (player)"
27.     trigger:
28.         if arg-1 is "byakugan":
29.             give arg-2 blaze rod named "Byakugan"
30.         else if arg-1 is "sharingan":
31.             give arg-2 blaze rod named "Sharingan"
32.         else:
33.             send "Use the following format: /dojutsu (byakugan/sharingan) (player)"

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Nope