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Let's see
>Friend Safari
>Pros
Two guaranteed perfect IVs at all times
Gen 1 and 6 starters available with HA
All 3 pokemon available at the same place
Chance of getting HA from the get go
>Cons
Must register a friend
Players are attributed a safari type and selection at random and therefore you have to register more friends to find the right pokemon
3rd slot will unlock only if friend has beaten the League
HA and 3rd slot only available when you get to the safari while you and your friend get online simultaneously
Fishable pokemon unavailable
>DexNav
>Pros
Wider variety of chainable pokemons
Can come with egg moves, HA, uncommon items and/or up to 3 guaranteed perfect IVs
Can find out ability, first move, held item and number of guaranteed perfect IVs before engaging battle
Usable almost anywhere
Ability to chain any pokemon you want
Likelihood of getting egg moves, HA and superior potential increases as your search level increases
>Cons
Likelihood of getting uncommon moves and such are still random
Must catch the pokemon to be able to chain it at a later time
Searching can turn up nothing in the whole section
Searching in caves or on water can be frustrating
I hope I forgot nothing.
Now make your choice.