If by 3rd form you mean the past participle, then it is 'fallen'.
If you mean the second form, the Adult Spectrobe, get it to Lv.30 then make it eat an evolve mineral. TAHDA. If you mean the 3rd form, the evolved form, this is their last form and therefore cannot evolve further. ....(TAHDA.)
"tiendra" is a form of the verb 'tenir', to hold, at the future tense, 3rd person singular.
Sceptile is Treekos 3rd Evolve form Steel-Cobra
The perfect tenses are formed by using the auxiliary verb "have" followed by the past participle of the main verb. For example, in the present perfect tense, you use "have" or "has" followed by the past participle. In the past perfect tense, you use "had" followed by the past participle.
It is a form (3rd per. sing.) of the verb revenir, which means to come back.
comía is the 3rd person imperfect form of the verb comer (to eat). So, comía means: I used to eat.
It has several meanings. Technically, it is the imperfect 3rd person past tense form of ir, meaning "to go", or sermeaning to be. So fue would mean "he/she/it went/was"
Found
Sent
win
'Tarquin' is probably referring to a shortened form of the name 'Tarquinius', which was part of the name of the 3rd from last and last king of the Roman kingdom.