Hngg difficult!
1. Thick club and Guts both raise the attack of The Pokemon that has them.
2. Ninada evolves into a Pokemon whose main ability also raises a stat.
That was super hard :(
Link Pokeball to Mismagius in 5 links without referencing any attacks.
Sorry, but even though it says so in the in-game description, Guts actually
doesn't boost the Attack stat. It multiplies damage from physical attacks by 1.5 along with ignoring attack drop from burn. While at 1st the difference might seem trivial, it actually has some impact. For instance, if a Pokemon has +2 Attack and Guts activated, it'd do 3 times the normal damage (+2 attack doubles the damage and Guts makes it triple). If Guts increased the Attack Stat by 1 stage, it'd have +3 Attack and do 2.5x damage, not 3x.
Here's another solution that satisfies my conditions.
1. Thick Club is an item found to be held by wild Pokemon.
2. Nincada has the ability Compoundeyes, which increases the likelihood of encountering a wild Pokemon with such a held item in Pokemon Emerald and subsequent main series games.
Now to answer yours-
1. Pokeballs can be used to catch wild Pokemon.
2. Some Pokemon, however, are uncatchable; like the Marowak in Pokemon Tower in Pokemon Red.
3. The Pokemon Tower is known to be the home of Ghost Pokemon.
4. Misdreavus is a Ghost Pokemon.
5. Mismagius is its evolved form.
Link Pikachu to azure flute in 3 steps without mentioning any Pokemon types.