I'm still of the opinion that Joltic is not high teir, and if it is, Klink should be...
Let's look at Joltic:
Obtained past mid-game: Chargestone Cave, after 5 badges
Only good against 1 Gym; the one immediatly afterwards.
It is good against two members of the E4, however, below average against one [Shuntal], and useless against one [Renbu has Stone Edge/Rock Slide everywhere]
Only parts it can help with in the finale are Hydregion, Bisharp, and Zoroark
all of which it has at outspeed and OHKO.
Gets very little outside of Electric and Bug attacks, aside from the obvious Normal.
Now let's look at Klink:
Obtained at the same point as Joltic [0-0]
Good against all remaining gyms [1-0 to Klink]
Good against 3 members of the E4, useless against one [2-0 to Klink]
Gets very little besides Electric, Steel and Normal attacks [2-0]
Can defeat N's Archeops, Carracosta, and hold it's own against N's KlinkKlang. It can beat Geechisu's Cofagirus with ease, and can set up on it. It also beats Bisharp [Spam Electric at it] [3-0]
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Tl;dr:
Klink is better against the bosses than Joltic
Klink has an equally restrictive movepool
Klink is gained at the same time as Joltic
... so why is Joltic higher-teir, if Klink outperforms it? Klink probobly gets bonus points for being one of two Steels avaliable before Badge 7 as well...