[nikhilvirus]

I prefer the tiers idea , 
a good idea for tiers might be :

Tier 0: upto 20 - only if u joined within last 2 months  - no weapons , no shiny allowed

Tier 1: upto Lvl 50 no shinies ( legends may be if u can find wild one at a 50) 

tier 2: upto lvl 100 shiny, legendaries and mega allowed ( no shiny-L , mega-L . shine-mega or Shiny-mega-L )

tier 3: lvl 100 only , all allowed 

this will give chance to all , and prizes can be kept accordingly